"I'M ALL RIGHT," I said, forcing myself out of the EMT's grasp. I made my way over to the boy, who was already strapped onto a gurney. He was being wheeled into a van. The only motion in his face was a slight flickering in his eyes. But he was alive. My God, I had saved his life.

Out on the street, onlookers were being ringed back by the police. I saw the redheaded kid who'd been riding his Razor. Other horrified faces crowded around.

All of a sudden I became aware of barking. Jesus, it was Martha, still tied to the post. I ran over to her and hugged her tightly as she licked my face.

A fireman made his way to me, a division captain's crest on his helmet. "I'm Captain Ed Noroski. You okay?"

"I think so," I said, not sure.

"You guys in the Hall can't be heroes enough on your own shift, Lieutenant?" Captain Noroski said.

"I was jogging by. I saw it blow. Looked like a gas explo-sion. I just did what I thought was right."

"Well, you did good, Lieutenant." The fire captain looked at the wreckage. "But this was no gas explosion."

"I saw two bodies inside."

"Yeah," Noroski said, nodding. "Man and a woman. Another adult in a back room on the first floor. That kid's lucky you got him out."

"Yeah," I said. My chest was filling with dread. If this was no gas explosion...

Then I spotted Warren Jacobi, my number one inspector, coming out of the crowd, badging his way over to me. War-ren had the "front nine," what we call the Sunday morning shift when the weather gets warm.

Jacobi had a paunchy ham hock of a face that never seemed to smile even when he told a joke, and deep, hooded eyes impossible to light up with surprise. But when he fixed on the hole where 210 Alhambra used to be and saw me, sooty, smeared, and sitting down, trying to catch my breath - Jacobi did a double take.

"Lieutenant? You okay?"

"I think so." I tried to pull myself up.

He looked at the house, then at me again. "Seems a bit run-down, even for your normal fixer-upper, Lieutenant. I'm sure you'll do wonders with it." He held in his grin. "We have a Palestinian delegation in town I know nothing about?"

I told him what I had seen. No smoke or fire, the second floor suddenly blowing out.

"My twenty-seven years on the job gives me the premoni-tion we're not talking busted boiler here," said Jacobi.

"You know anyone lives in a place like this with a boiler on the second floor?"

"No one I know lives in a place like this. You sure you don't want to go to the hospital?" Jacobi bent down over me. Ever since I'd taken a shot in the Coombs case, Jacobi'd become like a protective uncle with me. He had even cut down on his stupid sexist jokes.

"No, Warren, I'm all right."

I don't even know what made me notice it. It was just sit-ting there on the sidewalk, leaning up against a parked car, and I thought, Shit, Lindsay, that shouldn't be there.

Not with everything that had just gone on.

A red school knapsack. A million students carry them. Just sitting there.

I started to panic again.

I'd heard of secondary explosions in the Middle East. If it was a bomb that had gone off in the house, who the hell knew? My eyes went wide. My gaze was fixed on the red bag.

I grabbed Jacobi. "Warren, I want everyone moved back away from here, now. Move everybody back, now!"