“You all right, Detective?” the officer asked over the line.

“Fine.”

“What’s this all about?”

“Homeowner was a wit in the crane collapse this morning. Unsub got his address. Planted an IED—the acid, not explosives. I mean it, don’t get close.”

“Roger that.”

A skidding turn.

“I’ll be there in fifteen,” she said and disconnected.

Then she turned her head slightly and said to the passengers in the backseat, “How you doing there?”

The woman, sitting directly behind her, said, “I think I’m going to be sick. I’m sorry.”

“We’re almost there.”

“Okay.”

“And you, sir?”

“I’m fine. I like your car.”

In the rearview mirror, Sachs could see the couple. She looked peaked. He was gazing over the interior of the Ford as if he were a prospective buyer.

The man was the workman—the witness—the unsub had just tried to kill.

The call Sachs had received in the town house had come from him. He identified himself as one of the workmen at the site that morning. She decided to interview him herself and drove to Queens.

She had been nearly to the house when she’d placed a call.

“Hello?” It was the voice of the witness she was on her way to meet.

She identified herself. “I just want to make sure you’re home. I’m almost there.”

There’d been a pause. “Well, didn’t he call you?” the worker asked.

“Who?”

“The other detective. He called me after you did. I assumed he’d tell you I gave him a statement, you know. There’s no need for you to come.”

Jesus … Sachs felt the jolt in her belly. Ignoring a sharp urge to cough, she had slammed the accelerator down. “Get out of your house. Now.”

Of course: the call had been from the unsub or an associate—somehow, they’d gotten the worker’s name and number and learning that he’d seen something, the man had to die. She knew the cast investigating the crane attack, and nobody would have called a witness without coordinating with Sachs.

“What do you—?”

She had said, “It wasn’t a cop. It’s the killer. You’re in danger. He knows you’re a witness. Get out now!”

“Oh, Lord.”

“I’m almost there. Go out your back door, walk through the yard of the house behind you to Twenty-Fourth. I’ll meet you there.”

How would he come at them? she’d wondered. No idea, so she called in both ESU—NYPD’s SWAT team—and reported an IED to Central and Bomb Squad.

She had then just arrived at the address and, scanning for any hostiles, skidded around the corner onto 24th. There they had clambered into the backseat—to the extent that an extremely pregnant woman could clamber—and Sachs spun tires, released ghosts of blue smoke.