‘Please,’ Rhyme said, refraining from rolling his eyes. ‘Those chemicals suggest human shit. We could run DNA but that would be a waste of time. Excuse the choice of words.’

‘Bathroom just before he came to the scene?’

‘Possibly, rookie, but I’d guess he picked it up from the sewage system somewhere. I think it tells us he’s been spending a lot of time in underground New York. That’s his killing zone. He’s comfortable there. And if there wasn’t any effluence at the Chloe Moore scene, that means he’s already got a few other sites selected. And it also tells us he’s scoping out his targets ahead of time.’

The parlor phone rang. Sachs answered. Had a brief conversation and then hung up. ‘The ME. Yep, COD was cicutoxin – and no tetrodotoxin. You were right, Mel: This was eight times more concentrated than what you’d find in a natural plant. And he sedated her with propofol. Neck and arm. Two injection sites.’

‘Prescription drug,’ Rhyme noted. ‘You can’t grow that in your backyard. How did he have access to that? Well, put it on the chart and let’s keep going. The tattoo itself. That’s what I’m really curious about.’

Rhyme gazed at the picture Sachs had taken: inkless but easy to see from the red, inflamed skin. A much clearer image than what he’d viewed through the video camera at the dim crime scene.

‘Man,’ Ron Pulaski said, ‘it’s good.’

‘I don’t know the tattoo world,’ Rhyme said. ‘But I wonder if there’re only a limited number of artists who could do that in a short period of time.’

‘I’ll hit some of the bigger parlors in town,’ Sellitto said. ‘See what I can find.’

Rhyme mused, ‘Those lines.’ He pointed to the border, scallops above and below the words. ‘You were right, Sachs. They look cut, not tattooed. Like he used a razor blade or scalpel.’

Sellitto muttered, ‘Just fucking decorations. What a prick.’

‘On the chart. Don’t know what to make of that. Now, the words: “the second”. Meaning? Thoughts?’

‘The second victim?’ Pulaski offered.

Sellitto laughed. ‘This guy ain’t really covering up his tracks. We probably woulda heard if there was a number one, don’tcha think? Bet CNN would’ve caught on.’

‘Sure, true. Wasn’t thinking.’

Rhyme regarded the picture. ‘Not enough to draw conclusions at this point. And what’s the rest of the message? My impression is that somebody who knows calligraphy that well also knows spelling and grammar. Lowercase “t” on the article “the”. So something preceded it. There’s no period so something comes after the phrase.’

Sachs said, ‘I wonder if it’s a line he made up. Or is it a quotation? A puzzle?’

‘No clue … Lon, get some bodies at HQ to search the databases.’