F COURSE THERE WAS NO SLEEP FOR ME THAT NIGHT. THE next day, Sunday, passed in a haze of fatigue and anxiety. I took Cody and Astor to a nearby park and sat on a bench while I tried to make sense of the pile of uncooperative information and conjecture I had come up with so far. The pieces refused to come together into any kind of picture that made sense. Even if I hammered them into a semi-coherent theory, it told me nothing that would help me understand how to find my Passenger.

The best I could come up with was a sort of half-formed notion that the Dark Passenger and others like it had been hanging around for at least three thousand years. But why mine should flee from any other was impossible to say—especially since I had encountered others before with no more reaction than raised hackles. My notion of the new daddy lion seemed particularly far-fetched in the pleasant sunlight of the park, against the background of the children twittering threats at one another. Statistically speaking, about half of them had new daddies, based on the divorce rate, and they seemed to be thriving.

I let despair wash over me, a feeling that seemed slightly absurd in the lovely Miami afternoon. The Passenger was gone, I was alone, and the only solution I could come up with was to take lessons in Aramaic. I could only hope that a chunk of frozen wastewater from a passing airplane would fall on my head and put me out of my misery. I looked up hopefully, but there, too, I was out of luck.

Another semi-sleepless night, broken only by a recurrence of the strange music that came into my sleep and woke me as I sat up in bed to go to it. I had no idea why it seemed like such a good idea to follow the music, and even less idea where it wanted to take me, but apparently I was going anyway. Clearly I was falling apart, sliding rapidly downhill into gray, empty madness.

Monday morning a dazed and battered Dexter staggered into the kitchen, where I was immediately and violently assaulted by Hurricane Rita, who charged at me waving a huge stack of papers and CDs. “I need to know what you think,” she said, and it struck me that this was something she definitely did not need to know, considering the deep bleakness of my thoughts. But before I could summon even a mild objection she had hurled me into a kitchen chair and began flinging the documents around.

“These are the flower arrangements that Hans wants to use,” she started, showing me a series of pictures that were, in fact, floral in nature. “This is for the altar. And it’s maybe a little too, oh, I don’t know,” she said desperately. “Is anybody going to make jokes about too much white?”

Although I am known for a finely tuned sense of humor, very few jokes based on the color white sprang to mind, but before I could reassure her on the subject, Rita was already flipping the pages.

“Anyway,” she said, “this is the individual table setting. Which hopefully goes with what Manny Borque is doing. Maybe we should get Vince to check it with him?”

“Well,” I said.

“Oh good lord, look at the time,” she said, and before I could speak even one more syllable she had dropped a pile of CDs in my lap. “I’ve narrowed it down to six bands,” she said. “Can you listen to these today and let me know what you think? Thanks, Dex,” she went on relentlessly, leaning to plant a kiss on my cheek and then heading for the door, already moving on to the next item on her checklist. “Cody?” she called. “It’s time to go, sweetie. Come on.”

There was another three minutes of commotion, the highlights of which were Cody and Astor sticking their heads in the kitchen door to say good-bye, and then the front door slammed and all was silent.

And in the silence I thought I could almost hear, as I had heard in the night, the faint echo of the music. I knew I should leap from my chair and charge out the door with my saber clamped firmly between my teeth—charge into the bright light of day and find this thing, whatever it was, beard it in its den and slay it—but I could not.

The Moloch Web site had stuck its fear into me, and even though I knew it was foolish, wrong, counterproductive, totally non-Dexter in every way, I could not fight it. Moloch. Just a silly ancient name. An old myth that had disappeared thousands of years ago, torn down with Solomon’s temple. It was nothing, a figment from prehistoric imaginations, less than nothing—except that I was afraid of it.

There seemed nothing else to do except to stumble through the day with my head down and hope that it didn’t get me, whatever it was. I was bone tired, and maybe that was adding to my sense of helplessness. But I didn’t think so. I had the feeling that a very bad thing was circling closer with its nose full of my scent, and I could already feel its sharp teeth in my neck. All I could hope for was to make its sport last a little longer, but sooner or later I would feel its claws on me and then I, too, would bleat, beat my heels in the dust, and die. There was no fight left in me; there was, in fact, almost nothing at all left in me, except a kind of reflex humanity that said it was time to go to work.

I picked up Rita’s stack of CDs and slogged out the door. And as I stood in the doorway of the house, turning the key to lock the front door, a white Avalon very slowly pulled away from the curb and drove off with a lazy insolence that cut through all my fatigue and despair and sliced right into me with a jolt of sheer terror that rocked me back against the door as the CDs slipped from my fingers and crashed onto the walk.

The car motored slowly up the street to the stop sign. I watched, nerveless and numb. And as its brake lights flicked off and it started up and through the intersection, a small piece of Dexter woke up, and it was very angry.

It might have been the absolute bold uncaring disrespect of the Avalon’s behavior, and it might have been that all I really needed was the jolt of adrenaline to supplement my morning coffee. Whatever it was, it filled me with a sense of righteous indignation, and before I could even decide what to do I was already doing it, running down the driveway to my car and leaping into the driver’s seat. I jammed the key into the ignition, fired up the engine, and raced after the Avalon.

I ignored the stop sign, accelerated through the intersection, and caught sight of the car as it turned right a few blocks ahead. I went much faster than I should have and saw him turn left toward U.S. 1. I closed the gap and sped up, frantic to catch him before he got lost in the rush-hour traffic.

I was only a block or so back when he turned north on U.S. 1 and I followed, ignoring the squealing brakes and the deafening chord of horn music from the other motorists. The Avalon was about ten cars ahead of me now, and I used all my Miami driving skills to get closer, concentrating only on the road and ignoring the lines that separated the lanes, even failing to enjoy the wonderful creativity of the language that followed me from the surrounding cars. The worm had turned, and although it might not have all its teeth, it was ready for battle, however it was that worms fought. I was angry—another novelty for me. I had been drained of all my darkness and pushed into a bright drab corner where all the walls were closing in, but enough was enough. It was time for Dexter to fight back. And although I did not really know what I planned to do when I caught up with the other car, I was absolutely going to do it.

I was half a block back when the Avalon’s driver became aware of me and sped up immediately, slipping into the far left lane into a space so tight that the car behind him slammed on its brakes and spun sideways. The two cars behind it smashed into its exposed side and a great roar of horns and brakes hammered at my ears. I found just enough room to my right to squeak through around the crash and then over to the left again in the now-open far lane. The Avalon was a block ahead and picking up speed, but I put the pedal down and followed.

For several blocks the gap between us stayed about the same. Then the Avalon caught up with the traffic that was ahead of the accident and I got a bit closer, until I was only two cars behind, close enough to see a pair of large sunglasses looking back at me in the side mirror. And as I surged up to within one car length of his bumper, he suddenly yanked his steering wheel hard to the left, bouncing his car up onto the median strip and sliding sideways down into traffic on the other side. I was past him before I could even react. I could almost hear mocking laughter drifting back at me as he trundled off toward Homestead.

But I refused to let him go. It was not that catching the other car might give me some answers, although that was probably true. And I was not thinking of justice or any other abstract concept. No, this was pure indignant anger, rising from some unused interior corner and flowing straight out of my lizard brain and down to my knuckles. What I really wanted to do was pull this guy out of his rotten little car and smack him in the face. It was an entirely new sensation, this idea of inflicting bodily harm in the heat of anger, and it was intoxicating, strong enough to shut down any logical impulses that might be left in me and it sent me across the median in pursuit.

My car made a terrible crunching noise as it bounced up onto the median and then down on the other side, and a large cement truck missed flattening me by only about four inches, but I was off again, heading after the Avalon in the lighter southbound traffic.

Far ahead of me there were several spots of moving white color, any one of which might have been my target. I stomped down on the gas and followed.

The gods of traffic were kind to me, and I zipped through the steadily moving cars for almost half a mile before I hit my first red light. There were several cars in each lane halted obediently at the intersection and no way around them—except to repeat my car-crunching trick of banging up onto the median strip. I did. I came down off the narrow end of the median and into the intersection just in time to cause severe inconvenience to a bright yellow Hummer that was foolishly trying to use the roads in a rational way. It gave a manic lurch to avoid me, and very nearly succeeded; there was only the lightest of thuds as I bounced neatly off its front bumper, through the intersection, and onward, followed by yet another blast of horn music and yelling.

The Avalon would be a quarter of a mile ahead if it was still on U.S. 1, and I did not wait for the distance to grow. I chugged on in my trusty, banged-up little car, and after only half a minute I was in sight of two white cars directly ahead of me—one of them a Chevy SUV and the other a minivan. My Avalon was nowhere to be seen.

I slowed just for a moment—and out of the corner of my eye I saw it again, edging around behind a grocery store in a strip mall parking lot off to the right. I slammed my foot down onto the gas pedal and slewed across two lanes of traffic and into the parking lot. The driver of the other car saw me coming; he sped up and pulled out onto the street running perpendicular to U.S. 1, racing away to the east as fast as he could go. I hurried through the parking lot and followed.

He led me through a residential area for a mile or so, then around another corner and past a park where a day-care program was in full swing. I got a little closer—just in time to see a woman holding a baby and leading two other children step into the road in front of us.

The Avalon accelerated up and onto the sidewalk and the woman continued to move slowly across the road looking at me as if I was a billboard she couldn’t read. I swerved to go behind her, but one of her children suddenly darted backward right in front of me and I stood on the brake. My car went into a skid, and for a moment it looked as if I would slide right into the whole slow, stupid cluster of them as they stood there in the road, watching me with no sign of interest. But my tires bit at last, and I managed to spin the wheel, give it a little bit of gas, and skid through a quick circle on the lawn of a house across the street from the park. Then I was back onto the road in a cloud of crabgrass, and after the Avalon, now farther ahead.

The distance stayed about the same for several more blocks before I got my lucky break. Ahead of me the Avalon roared through another stop sign, but this time a police cruiser pulled out after it, turned on the siren, and gave chase. I wasn’t sure if I should be glad of the company or jealous of the competition, but in any case it was much easier to follow the flashing lights and siren, so I continued to slog along in the rear.

The two other cars went through a quick series of turns, and I thought I might be getting a little closer, when suddenly the Avalon disappeared and the cop car slid to a halt. In just a few seconds I was up beside the cruiser and getting out of my car.

In front of me the cop was running across a close-cropped lawn marked with tire tracks that led around behind a house and into a canal. The Avalon was settling down into the water by the far side and, as I watched, a man climbed out of the car through the window and swam the few yards to the opposite bank of the canal. The cop hesitated on our side and then jumped in and swam to the half-sunk car. As he did, I heard the sound of heavy tires braking fast behind me. I turned to look.

A yellow Hummer rocked to a stop behind my car and a red-faced man with sandy hair jumped out and started to yell at me. “You cocksucker son of a bitch!” he hollered. “You dinged up my car! What the hell you think you’re doing?”

Before I could answer, my cell phone rang. “Excuse me,” I said, and oddly enough the sandy-haired man stood there quietly as I answered the phone.

“Where the hell are you?” Deborah demanded.

“Cutler Ridge, looking at a canal,” I said.

It gave her pause for a full second before she said, “Well, dry off and get your ass over to the campus. We got another body.”