The dirty water cascading out of the high inflow pipes kicked up spray when it met the pool, splashing my jeans to mid thigh. But I couldn't get any filthier or hardly any more miserable.

As soon as that thought crossed my mind, I tried to reel it back because it seemed like a challenge to the universe. No doubt inside of ten minutes, I would be astonishingly filthier and immensely more miserable than I was at that moment.

I reached overhead, got a two-hand grip on the lip of the new drain, toed the wall, muscled myself up and in.

Ensconced in this new warren, I considered waiting until Andre appeared at the mouth of the tunnel that I had left, and shooting him from my elevated position. For a guy -who had been so reluctant even to handle firearms earlier this same day, I had developed an unseemly eagerness to pump my enemies full of lead.

The flaw in my plan immediately became clear to me. Andre had a gun of his own. He would be cautious about leaving that lower tunnel, and when I fired at him, he would fire back.

All of these concrete walls, more ricochets, more earsplitting noise…

I didn't have sufficient ammunition to keep him pinned down until the water rose into his drain and forced him to retreat. The best thing I could do was keep moving.

The tunnel into which I had climbed would be the last of the three outflow drains to take water. In an ordinary storm, it would probably remain dry, but not in this deluge. The level of the pool below rose visibly, minute by minute.

Happily, this new tunnel was of greater diameter than the previous one, perhaps four feet. I would not have to crawl. I could proceed at a stoop and make good time.

I didn't know where that progress would take me, but I was game for a change of scenery.

As I gathered myself off the floor and into the aforementioned stoop, a shrill twittering arose in the chamber behind me. Andre didn't strike me as a guy who would twitter, and at once I knew the source of the cries: bats.

FIFTY-SIX

HAIL IN THE DESERT IS A RARITY, BUT ONCE IN A WHILE, a Mojave storm can deliver an icy pelting to the land.

If hail had fallen outside, then as soon as I felt boils forming on my neck and face, I could be certain that God had chosen to amuse Himself by restaging the ten plagues of Egypt upon my beleaguered person.

I don't think that bats were one of the Biblical plagues, though they should have been. If memory serves me, instead of bats, frogs terrorized Egypt.

Large numbers of angry frogs won't get your blood pumping half as fast as will a horde of incensed flying rodents. This truth calls into question the deity's skill as a dramatist.

When the frogs died, they bred lice, which was the third plague. This from the same Creator who painted the sky blood-red over Sodom and Gomorrah, rained fire and brimstone on the cities, overthrew every habitation in which their people tried to hide, and broke every building stone as though it were an egg.

Circling the catch basin on the ledge and levering myself into the highest tunnel, I had not pointed the light directly overhead. Evidently a multitude of leathery-winged sleepers had depended from the ceiling, quietly dreaming.

I don't know what I did to disturb them, if anything. Night had fallen not long ago. Perhaps this was the usual time at which they woke, stretched their wings, and flew off to snare themselves in little girls' hair.

As one, they raised their shrill voices. In that instant, even as I finished rising into a stoop, I dropped flat, and folded my arms over my head.

They departed their man-made cave by the highest of the outflow drains. This route would never entirely fill with water and would always offer at least a partially unobstructed exit.

If I'd been asked to estimate the size of their community as they passed over me, I would have said "thousands." To the same question an hour later, I would have replied "hundreds." In truth, they numbered fewer than one hundred, perhaps only fifty or sixty.

Reflected off the curved concrete walls, the rustle of their wings sounded like crackling cellophane, the way movie sound-effects specialists used to rumple the stuff to imitate all-devouring fire. They didn't stir up much of a breeze, hardly an eddy, but brought an ammonial odor, which they carried away with them.

A few fluttered against my arms, with which I protected my head and face, brushed like feathers across the backs of my hands, which should have made it easy to imagine that they were only birds, but which instead brought to mind swarming insects-cockroaches, centipedes, locusts-so I had bats for real and bugs in the mind. Locusts had been the eighth of Egypt 's ten plagues.

Rabies.

Having read somewhere that a quarter of any colony of bats is infected with the virus, I waited to be bitten viciously, repeatedly. I didn't sustain a single nip.

Although none of them bit me, a couple crapped on me in passing, sort of like a casual insult. The universe had heard and accepted my challenge: I was now filthier and more miserable than I had been ten minutes previously.

I rose into a stoop again and followed the descending drain away from the catch basin. Somewhere ahead, and not too far, I would find a manhole or another kind of exit from the system. Two hundred yards, I assured myself, three hundred at most.

Between here and there, of course, would be the Minotaur. The Minotaur fed on human flesh. "Yeah," I muttered aloud, "but only the flesh of virgins." Then I remembered that I was a virgin.

The flashlight revealed a Y in the tunnel, immediately ahead. The branch to the left continued to descend. The passage to the right fed the one I'd been following from the catch basin, and because it rose, I figured it would lead me closer to the surface and to a way out.

I had gone only twenty or thirty yards when, of course, I heard the bats returning. They had soared out into the night, discovered a tempest raging, and had fled at once back to their cozy subterranean haven.

Because I doubted that I would escape a second confrontation unbitten, I reversed directions with an agility born of panic and ran, hunched like a troll. Returning to the down-bound tunnel, I went to the right, away from the catch basin, and hoped the bats would remember their address.

When their frenzied flapping crescendoed and then diminished behind me, I came to a halt and, gasping, leaned against the wall.

Maybe Andre would be on the ledge, crossing from the lowest drain to the highest, when the bats returned. Maybe they would frighten him, and he would fall into the catch basin, skewering himself on those samurai swords.

That fantasy brought a brief glow to my heart, but only brief because I couldn't believe that Andre would be afraid of bats. Or afraid of anything.

An ominous sound arose that I had not heard before, a rough rumbling, as if an enormous slab of granite was being dragged across another slab. It seemed to be coming from between me and the catch basin.

Usually this meant that a secret door in a solid-stone wall would roll open, allowing the evil emperor to make a grand entrance in knee-high boots and a cape.

Hesitantly, I moved back toward the Y, cocking my head one way, then the other, trying to determine the source of the sound.

The rumble grew louder. Now I perceived it as less like stone sliding over stone than like friction between iron and rock.

When I pressed a hand to the wall of the tunnel, I could feel vibrations passing through the concrete.

I ruled out an earthquake, which would have produced jolts and lurches instead of this prolonged grinding sound and consistent level of shaking.

The rumbling stopped.

Under my hand, vibrations were no longer coursing through the concrete.