Haumann said, ‘We’ll follow up. We have a picture of your unsub from the homicide yesterday, the Identi-Kit image.’

She pictured the surly, Slavic-looking face, the weirdly light eyes.

The ESU leader said to the men he’d called around him, ‘Deploy. Go find him. And somebody call it in to Midtown South. I want a team moving west down Fifty-two Street. We’ll hem him in, if we can.’

‘Yessir.’

They trotted off.

As much as she wanted to go with them – she considered handing off the crime scene – Sachs finished dressing for the grid.

When she was gowned, bootied and hooded, she grabbed the collection kit and, with a glance back at the street down which the fish had swum away, Sachs started for the door of the restaurant.

CHAPTER 30

Sachs was grateful that, as at the previous scene, she didn’t have to lug the heavy halogen spots down to the murder site; they were already set up and burning brightly.

Thank you, first responders.

She glanced at the diagram from Rhyme’s database of underground New York to orient herself.

There were some similarities to the prior scene: the waterpipe, the utility conduits, the yellow boxes marked IFON. But there was a major difference too. This space was much bigger. And she could climb directly into it through the access doorway in the bathroom. No circular coffin breadbaskets.

Thank you …

From the ancient wooden pens surrounding the dirt floor, she deduced that it had been part of a passageway to move animals to and from one of the stockyards that used to operate near here, in Hell’s Kitchen. She remembered that the perp seemed to be influenced by the Bone Collector; that killer too had used a former slaughterhouse as a place to stash one of his victims – and staked her down, bloody, so she would be devoured alive by rats.

Unsub 11-5 certainly had learned at the feet of a master.

The access door in the restroom opened into a large octagon, from which three tunnels disappeared into the darkness.

Sachs clicked on the video and audio feed. ‘Rhyme? You there?’

‘Ah, Sachs. I was wondering.’

‘He might’ve come back again. Like on Elizabeth Street.’

‘Returned to the scene?’

‘Or never left. I saw someone on the street, matching. Bo Haumann’s got officers checking it out.’

‘Anything?’

‘Not yet.’

‘Why’s he coming back?’ Rhyme mused. Not expecting an answer.

The camera was pointed in the direction she was looking – toward the dimness of a tunnel’s end. Before turning to the body, though, she slipped rubber bands over her booties and tracked along the unsub’s footprints, also muted by protective plastic, which led down one of the tunnels.

‘That’s how he got in? I can’t see clearly.’

‘Looks that way, Rhyme. I see some lights up ahead.’