“In a way, yes,” Porcelain said. “I saw her with my mind.”

  This I could understand—at least a little. I could see things with my own mind: the way, for instance, that trimethylamine could be produced by allowing Bacillus prodigiosus to grow on a sample of Mrs. Mullet’s mashed potatoes in the heat of a summer afternoon. The resulting blood-red specks—which were known in the Middle Ages as “Wunderblut,” or “strange blood,” and which for a whole week in 1819 had appeared on various foods at Padua—would release not only the smell of ammonia, but also the unmistakeable odor of trimethylamine.

  When you come right down to it, I suppose, there is no great difference between ghosts and the invisible worlds of chemistry.

  I was glad I had remembered dear old trimethylamine: my chemical friend with the fishy smell. I had discussed it with Dogger several days ago and formed certain opinions which I had been prevented from acting upon.

  It was time now to pick up the threads and follow them, wherever they might lead.

  “I’m tired,” I told Porcelain, yawning vastly.

  Five minutes later we were tucked up in bed, one of us drifting rapidly towards oblivion.

  I waited until she was asleep, then slipped quietly out of bed.

  It was just past midnight when I eased shut my bedroom door and crept silently down the curving staircase.

  I remembered that Dogger kept a high-powered torch in the butler’s pantry for what he called “midnight emergencies,” and it took only a moment to find it.

  No frail candle this time, I thought: I had at my fingertips sufficient power to light up the Palace Pier at Brighton. I hoped it would be enough.

  The cellars seemed colder than I had remembered. I should have worn a sweater, but it was too late now.

  I was quickly at the point where the electric bulbs ended: beyond them, a cavernous blackness that led—who knew where?

  I switched on the torch and pointed it along the passageway. Far ahead, I could see the outline of the sedan chair. I no longer relished the thought of climbing into the thing and recalling days gone by; in fact, I would be relieved to get past it.

  “There is no lady,” I said aloud, and to my relief, there wasn’t.

  Ahead, the passage took a slight shift to the right. Since I had essentially set off to the right from the bottom of the kitchen stairs, I was heading east—now a little southeast, towards the Visto and the Poseidon fountain.

  The gum-boot footprints were easy to follow now, no longer overprinted with Porcelain’s and mine. There were several sets, I noted, three coming and two going. If, as I suspected, they were Brookie’s, he had made his first trip to steal one of the firedogs, his second to return it and make off with the second. On his last visit he had left by way of the French doors.

  A sudden cold draft swept past me. Good job I’d brought the torch—the candle would certainly have blown out.

  With the draft came a dark and a dank odor: an odor I could not at once identify, but one which suggested the reservoirs of neglected water closets: green corrosion with more than a whiff of zinc.

  Well, I thought, I’m not afraid of zinc, and green corrosion is something that has always interested me.

  I pushed on.

  When I had been down here earlier with Porcelain, I had heard a definite metallic clank, but now the passage—which had begun to narrow—was as silent as the tomb.

  In front of me was an archway with an open door, beyond which, or so it seemed, was a room.

  I took two careful steps down into the chamber and found myself surrounded on all sides with metal pipes: zinc pipes, lead pipes, iron pipes, bronze pipes, copper pipes; pipes running up, down, and across, all interconnected with right elbows and great metal bolts with here and there a huge valve like the steering wheel of a motorcar.

  I was at the very heart of Lucius de Luce’s subterranean waterworks!

  And then I heard it—a metallic clanking that echoed round and round the chamber.

  I’ll admit it—I froze.

  Another clank.

  “Hello,” I called, my voice shaking. “Is anyone there?”

  From somewhere came another sound: an animal sound for certain, though whether it was human, I could not tell.

  What if a fox had made its way into the tunnel? Or a badger?

  If that was the case, it would likely run away from a human with a torch—but what if it didn’t?

  “Hello?” I called again. “Is anyone there?”

  Again a muffled sound, weaker. Was it farther away, or was I imagining things? One thing was certain: It could only be coming from somewhere behind a giant pipe that rose up out of the stonework, leveled off, bent ninety degrees, and headed off towards the far side of the chamber.

  I scrambled up onto the thing, straddled it for a moment—then dropped down on the other side.

  The passageway into which the pipe led was lower, narrower, and damp. Moisture beaded on the walls, and the floor, between bricks, was wet earth.

  Just ahead, the tunnel was blocked by an iron gate: an iron gate that was chained shut and locked on the other side with a large, old-fashioned padlock.

  I gave the thing a rattle, but it was absolutely solid. Without a key, there wasn’t a hope of getting past.

  “Damn!” I said. “Damn and double damn!”

  “Flavia?” someone croaked.

  I must admit that I came very close to disgracing myself.

  I shone the beam through the bars and picked out a shape huddled on the ground.

  For as long as I live I shall never forget his white face staring up at me, blinded by the torch’s beam. He had managed, somehow, to lose his spectacles, and his pale eyes, blind and blinking, were those of a baby mole pulled from its hole and dragged out suddenly into the daylight.

  “Colin?” I said. “Colin Prout?”

  “Turn it off!” he pleaded in a ragged voice, twisting away from the light.

  I swung the torch away, so that the passage beyond the bars was once more in near-darkness.

  “Help me,” Colin said, his voice pitiful.

  “I can’t. The gate is locked.”

  I gave the massive thing a shake with one hand, hoping it would spring open—perhaps by some as-yet-undiscovered magic—but that did not happen.

  “Try it from your side,” I told him. “There might be a latch …”

  I knew, even as I said it, that there wasn’t, but anything was worth a try.

  “Can’t,” Colin said, and even in the darkness I could tell that he was on the verge of tears. “I’m tied up.”

  “Tied up?” It seemed impossible, even though I had once or twice been in the same position myself.

  “I’ve got the key, though. It’s in me pocket.”

  Praise be! I thought. Finally, a bit of luck.

  “Wiggle yourself over to the gate,” I said. “I’ll try to reach the key.”

  There was a painful silence, and then he said, “I’m … I’m tied to somethin’.”

  And he began to whimper.

  It was enough to make a saint spit!

  But wait: The padlock was on Colin’s side of the gate, wasn’t it? I had noticed this but not given it my proper attention.

  “Did you lock yourself in?” I asked.

  “No,” Colin snuffled.

  “Then how did you get in there?”

  “We come through the door in the fountain.”

  A door in the fountain? We?

  I chose to ask the most important question first.

  “Who’s ‘we,’ Colin? Who did this to you?”

  I could hear him breathing heavily in the darkness, but he did not answer.

  I realized at once the futility of it all. I was not about to spend the rest of my life trying to pry answers out of a captive from whom I was separated by a wall of iron bars.

  “All right, then,” I said. “It doesn’t matter. Tell me about the door in the fountain. I’ll come round and let you out.”

&
nbsp; It made me furious, actually, to think that I should have to ask a stranger about a secret door at Buckshaw—and secret it must be, for I had never heard of such a thing myself. Such mysteries were surely meant to be handed down by word of mouth from one family member to another, not practically pried from a near-stranger who skulked about the countryside in the company of a poacher.

  “Simon’s toe,” Colin said.

  “What? You’re not making any sense.”

  The sound of sobbing told me there was no more to be got from him.

  “Stay here,” I said, although it made no sense. “I’ll be back before you know it.”

  “No, wait!” he cried. “Give me the torch. Don’t leave me alone!”

  “I have to, Colin. I need the torch to light my way.”

  “No, please! I’m ’fraid of the dark!”

  “Tell you what,” I said. “Close your eyes and count to five hundred and fifty. It won’t be dark with your eyes closed. When you finish, I’ll be back. Here—I’ll help you start. One … two … three …”

  “Can’t,” Colin interrupted, “I ’aven’t learnt my hundreds.”

  “All right, then, let’s sing. Come on, we’ll sing together:

  “God save our gracious King,

  Long live our noble King,

  Long may he …

  “Come on, Colin, you’re not singing.”

  “Don’t know the words.”

  “All right, then, sing something you know. Singing will make me come back sooner.”

  There was a long pause, and then he began in a cracked and quavering voice:

  “London Bridge is … fallin’ down

  Fallin’… down, fallin’ down

  London Bridge is fallin’ down …”

  I turned round and began to pick my way carefully back along the passage, the sound of Colin’s voice soon becoming no more than a faint echo. Leaving him there, alone in the darkness, was one of the most difficult things I’ve ever had to do, although I can’t say why. Life is full of surprises like that.

  The return journey seemed endless. Time had surely slowed as I made my way back beneath the low arched ceilings to the cellars.

  Up the steps I went and into the kitchen. Although the house was in perfect silence, I paused anyway to listen at the door.

  Nothing.

  Technically, I knew, I was not being disobedient. I had been forbidden to leave home, and I had no intention of doing so. The Poseidon fountain was well within the bounds of Buckshaw, which allowed me to have my cake and jolly well eat it, too.

  I slipped quietly out the back door, leaving it unlocked, and into the kitchen garden. Overhead, the stars twinkled like a million mad eyes, while the moon, already halfway to its first quarter, hung like a broken silver fingernail in the night sky.

  Ordinarily, even though it wasn’t far to the Poseidon fountain, I’d have taken Gladys with me, if only for company. But now, when a single one of her excited squeaks or rattles might awaken the household, I simply couldn’t risk it.

  I set out at a brisk walk through the wet grass, across the east lawn towards the Visto. Somewhere, an owl hooted, and something tiny scurried through the dead leaves.

  Then suddenly, almost without warning, Poseidon was looming above me, odd angles of his metal anatomy catching the starlight, as if some ancient part of the galaxy had fallen to earth.

  I climbed up the steps to the base. What was it Colin had said?

  “Simon’s toe.” Yes, that was it—but what had he meant?

  Of course! Poseidon’s toe!

  He must have heard the name from Brookie and got it muddled.

  I scrambled up onto the fountain’s lower bowl. Now Poseidon’s giant foot was almost in my face, its big toe curled back as if someone were tickling his tummy.

  I reached out and touched the thing—shoved it down as hard as I could. The toe moved—as if on a hidden hinge—and from somewhere below came a distinct metallic snick.

  “Simon’s toe,” I said aloud, smiling and shaking my head, proud of myself for having solved the puzzle.

  I climbed down to the ground and—yes!—there it was! One of the large sculptured panels of water nymphs that formed the fountain’s decorative base had sprung out slightly from the others.

  How devilishly clever of old “Leaking de Luce” to have hidden the lock’s release in one of the statue’s feet, where it wouldn’t be easily discovered.

  The hatch swung open with a groan and I stepped carefully into the fountain’s base. As I had suspected it might, a single lead pipe emerged from one of several grottos below and bent up sharply to feed water to the fountain. A large arm-valve was obviously meant to control the flow, and although a heavy covering of cobwebs told me that it had not been used for ages, I was surrounded by the sound of dripping water which echoed unnervingly in the dankness of the confined chamber.

  A dozen precarious steps led down into a wide, rectangular pit at the bottom of the fountain.

  They were splattered with blood!

  On the edge of the bottom step was a large stain, while diminishing dribbles marked the ones higher up.

  The blood had been here for some time, as was evident from its brown, well-oxidized appearance.

  This must be the spot where Brookie met his death.

  Avoiding the splotches, I picked my way gingerly to the bottom.

  The pit was surprisingly spacious.

  To one side, overhead, an iron grating revealed slits of the night sky: the stars still shining brightly, giving off so much light, in fact, that even the towering outline of Poseidon himself was visible far above. Gaping upwards at this novel viewpoint, I somehow managed to misstep. I twisted my ankle.

  “Damn!” I said, pointing the torch at the ground to see what had caused my injury.

  It was a rope, and it lay coiled in the circle of light like a self-contented viper sunning itself after a particularly satisfying lunch.

  I can’t say that I was surprised, since I had already deduced that there would likely be a rope. I had simply forgotten about it until I tripped on the stupid thing.

  What was surprising, though, was that the police had not discovered such a crucial bit of evidence: a surprising misstep, not only for me, but also for them.

  Better not touch it, I thought. Best leave it in place for Inspector Hewitt’s men. Besides, I already knew as much as I needed to know about this particular remnant of the crime.

  With a couple of halting steps, I limped towards an open tunnel.

  But wait! Which of these openings would lead me back to Colin?

  The one on the left, I thought, although I could hardly be sure. Lucius de Luce’s plan had shown a bewildering maze of subterranean waterworks, and only now that I thought about it did I remember shoving the folded map into my pocket.

  I grinned, realizing that help was right here at my very fingertips. But when I reached for it, my pocket was empty.

  Of course! I had changed my dusty dress for a clean one, and I let slip a mental curse as I realized that Lucius’s priceless hand-drawn map was, at this very moment, soaking its way to blankness in a laboratory sink!

  There was nothing for it now but to follow my instincts and choose a tunnel: the one on my left.

  Here at its eastern extremity, the corridor was not only lower and more narrow, but had fallen into scandalous disrepair. The brick walls and pieces of the roof had crumbled in places, covering parts of the floor with broken rubble.

  Careful, I thought. The whole thing might cave in and—

  Something slapped my face—something dangling from the roof like a dead white arm. I let out a little yelp and stopped in my tracks.

  A root! I had been frightened by a stupid root that had been put down, perhaps by one of the long gone borders which had, in earlier times, shaded the walkways of the Visto.

  Even though I ducked under the thing, its slimy finger still managed to caress my face, as if it were dying for want of human company.

>   I limped along, the light of the torch sweeping wildly in front of me.

  Here, on both sides of the tunnel, a dusty assortment of ladders, ropes, pails, watering cans, and galvanized funnels had been left, as if the groundskeepers who had used them had wandered off to war and forgotten to return.

  A sudden flash of red brought me to a stop. Someone had written on the wall. I let the light play slowly over the painted letters: H.d.L.

  Harriet de Luce! My mother had been here before me—found her way through this same tunnel—stood on these same bricks—painted her initials on the wall.

  Something like a shiver overtook me. I was surrounded with Harriet’s presence. How, when I had never known her, could I miss her so deeply?

  Then, faintly, from far along the tunnel, there came to my ears the sound of a voice—singing.

  “London Bridge is fallin’ down … my fair lady.”

  “Colin!” I shouted, and suddenly my eyes were brimming. “Colin! It’s me, Flavia.”

  I lurched forward, tripping over fallen stones, feeling the ooze in my shoes from the tunnel’s seepage. My hands were raw from clutching at the rough wall for support.

  And then, there he was …

  “My fair lady,” he was singing.

  “It’s all right, Colin. You can stop now. Where’s the key?”

  He winced at the light, then stared at me with a strange, offended look.

  “Untie me first,” he said gruffly.

  “No—key first,” I said. “That way you won’t run off with it.”

  Colin groaned as he rolled slightly onto his left side. I reached into his pocket—Ugh!—and pulled out an iron key.

  As he twisted, I could see that Colin’s wrists were bound firmly behind him and lashed to an iron pipe that rose up vertically before vanishing into the roof.

  The poor creature could have been tied up here for days!

  “You must be in agony,” I said, and he looked up at me again with such blank puzzlement that I wondered if he knew the meaning of the word.

  I struggled with the knots. Colin’s efforts to free himself and the moisture from the seeping walls had shrunken them horribly.

  “Do you have a knife?”