It was early in California but the tech managed to track down somebody and put some pressure on him to find and upload the images. The pictures arrived soon after. They were striking but not particularly helpful. There were, as Sellitto had suggested, hundreds, possibly thousands of buildings that showed indications of elevated heat, and the system couldn't discriminate between locations that were being reroofed, under construction, being heated with Consolidated Edison steam or simply had particularly hot chimneys.

All Rhyme could think to do was tell Central that any assaults or break-ins in or near a building having roofing work done should be patched through to them immediately.

The dispatcher hesitated and said she'd put the notice on the main computer.

The tone of her voice suggested that he was grasping at straws.

What could he say? She was right.

Lucy Richter closed the door to her co-op and flipped the locks.

She hung up her coat and hooded sweatshirt, printed on the front with 4th Infantry Division, Fort Hood, and on the back the division's slogan: Steadfast and loyal.

Her muscles ached. At the gym, she'd done five miles, at a good pace and 9-percent incline, on the treadmill, then a half hour of push-ups and crunches. That was something else military service had done: taught her to appreciate muscle. You can put down physical fitness if you want, make fun of it as vanity and a waste of time but, fact is, it's empowering.

She filled the kettle for tea and pulled a sugared doughnut out of the fridge, thinking about today. There were plenty of things that needed to be done: phone calls to return, emails, baking cookies and making her signature cheesecake for the reception on Thursday. Or maybe she'd just go shopping with friends and buy dessert at a bakery. Or have lunch with her mother.

Or lie in bed and watch the soaps. Pamper herself.

It was the start of heaven-her two weeks away from the land of the bitter fog-and she was going to enjoy every minute of it.

Bitter fog…

This was an expression she'd heard from a local policeman outside Baghdad, referring to fumes and smoke following the detonation of an IED-improvised explosive device.

Explosions in movies were just big flares of flaming gasoline. And then were gone, nothing left, except the reaction shot on the characters' faces. In reality what remained after an IED was a thick bluish haze that stank and stung your eyes and burned your lungs. Part dust, part chemical smoke, part vaporized hair and skin, it remained at the scene for hours.

The bitter fog was a symbol of the horror of this new type of war. There were no trusted allies except your fellow soldiers. There were no battle lines. There were no fronts. And you had no clue who the enemy was. It might be your interpreter, a cook, a passerby, a local businessman, a teenager, an old man. Or somebody five klicks away. And the weapons? Not howitzers and tanks but the tiny parcels that produced the bitter fog, the packet of TNT or C4 or C3 or the shaped charge stolen from your own armory, hidden so inconspicuously that you never saw it until…well, the fact was you never saw it.

Lucy now rummaged in a cabinet for the tea.

Bitter fog…

Then she paused. What was that sound?

Lucy cocked her head and listened.

What was that?

A ticking. She felt her stomach twist at the sound. She and Bob had no wind-up clocks. But that's what it sounded like.

What the hell is it?

She stepped into the small bedroom, which they used mostly as a closet. The light was out. She flicked it on. No, the sound wasn't coming from there.

Her palms sweating, breath coming fast, heart pounding.

I'm imagining the sound… I'm going crazy. IED's don't tick. Even timed devices have electronic detonators.

Besides, was she actually thinking that somebody had left a bomb in her co-op in New York City?

Girl, you need some serious help.

Lucy walked to the master bedroom doorway. The closet door was open, blocking her view of the dresser. Maybe it was…She stepped forward. But then paused. The ticking was coming from someplace else, not in here. She went up the hall to the dining room and looked inside. Nothing.

She then continued on to the bathroom. She gave a laugh.

Sitting on the vanity, next to the tub, was a clock. It looked like an old one. It was black and on the face was a window with a full moon staring at her. Where had it come from? Had her aunt been cleaning out her basement again? Had Bob bought it when she was away and set it out this morning after she'd left for the health club?

But why the bathroom?

The freaky moon face looked at her with its curious gaze, almost malevolent. It reminded her of the faces of the children along the roadside, their mouths curved into an expression that wasn't quite a smile; you had no idea what was going on in their heads. When they looked at you, were they seeing their saviors? Their enemy? Or creatures from another planet?

Lucy decided she'd call Bob or her mother and ask about the clock. She went into the kitchen. She made the tea and carried the mug into the bathroom, the phone too, and ran water into the tub.

Wondering if her first bubble bath in months would do anything to wash away the bitter fog.

On the street in front of Lucy's apartment Vincent Reynolds watched two schoolgirls walk past.

He glanced at them but felt no deepening of the hunger already ravaging his body. They were high school kids and too young for him. (Sally Anne had been a teenager, true, but so had he, which made it okay.)

Through his cell phone, Vincent heard Duncan's whispered voice. "I'm in her bedroom. She's in the bathroom, running a bath… That's helpful."

Water boarding…

Because the building had a lot of tenants, and he could easily be spotted picking the lock, Duncan had climbed to the top of a building several doors down and made his way over the roofs to Lucy's, then down the fire escape and into her bedroom. He was real athletic (another difference between the friends).

"Okay, I'm going to do it now."

Thank you…

But then he heard, "Hold on."

"What?" Vincent asked. "Is something wrong?"

"She's on the phone. We'll have to wait."

Hungry Vincent was sitting forward. Waiting was not something he did well.

A minute passed, two, five.

"What's going on?" Vincent whispered.

"She's still on the phone."

Vincent was furious.

Goddamn her…He wished he could be there with Duncan to help kill her. What the hell was she doing making phone calls now? He wolfed down some food.

Finally the Watchmaker said, "I'm going to try to get her off the phone. I'll go back up to the roof and come down the stairs into the hallway. I'll get her to open the door." Vincent heard some rare emotion in the man's next comment. "I can't wait any longer."

You don't know the half of it, thought Clever Vincent, who surfaced momentarily before being sent away by his starving other half.

Stripping for her bath, Lucy Richter heard another sound. Not the ticking of the moon clock. From somewhere nearby. Inside? The hallway? The alley?

A click. Metallic.

What was it?

The life of the soldier is the sound of metal on metal. Slipping the long rounds of rifle ammo, fragrant with oil, into the clips, loading and locking the Colts, vehicle door latches, fueler's belt buckles and vests clinking. The ring of a slug from an AK-47, dancing off a Bradley or Humvee.

The noise again, click, click.

Then silence.

She felt chill air, as if a window was open. Where? The bedroom, she decided. Half naked, she walked to the bedroom doorway and glanced in. Yes, the window was open. But when she'd glanced in earlier, hearing the ticking, hadn't it been closed? She wasn't sure.