Sachs asked, “This the first time there’s been affordable housing extortion in the city?”

“Protests, peaceful shit. Chaining themselves to jobsites, throwing eggs. Never violence.”

Rhyme’s eyes were on the wreckage. From a distance, the machines looked fragile. But the close-up images in the videos showed sturdy steel rods and support brackets.

Then again, had the Kommunalka Project actually been behind it?

“Timing?” he asked.

A pause. “How’s that, Captain?”

“Did the demand come in before the crane fell or after?”

“Oh, you’re thinking it was an accident and this group jumped on the bandwagon. It was ten minutes before the collapse.”

Answering that question.

Sachs asked, “We’re looking at the news. Nothing about the demand.”

“No. We’re not announcing. That’ll mean panic. I’ve ordered all high-rise construction suspended for the time being and we’re getting officers to every site where there’s a tower crane.”

“That’s going to raise questions,” Sachs pointed out.

In an off-hand tone, Harrison said, “Ah, I’ll blame the feds or something. Hold on.”

Voices, urgent, sounded in the background of the mayor’s call.

“I have to go, Captain, Detectives. Please, do whatever you can. The city’s resources? They’re at your disposal. Liaise with the Bureau and DHS.”

The call was disconnected.

Staring at the wreckage again. The blue of the tower was brilliant. Was it painted that way for safety? Or to advertise? Or simply cosmetics?

Sellitto poured some coffee from the carafe that had materialized. He walked to the computer monitor on the wall and squinted as he read the terrorists’ note.

“So, they’re not the brightest bulbs,” he said. “Maybe we can use that.”

“How’s that?” Rhyme queried.

“Misspellings—‘obsene.’ And ‘its’ without an apostrophe.”

Rhyme clicked his tongue. “Those were intentional, to make us think they’re stupid. They’re not.”

“Yeah?”

“Other rules of grammar and punctuation’re right. They use ‘that’ and ‘which’ correctly. ‘That’ restricts the meaning of the preceding word: ‘the properties that are on the list below.’ ‘Which’ is nonrestrictive—providing optional information. For instance: where they happened to have learned about the city’s lack of redevelopment plans.”

“Linc—”

“And they use ‘since’ correctly too, meaning ‘from a point in time.’ Itcanbe used to mean ‘because,’ but that’s not preferred. And see, they use ‘because’ in the proper sense a few sentences later. And the apostrophe before the gerund. ‘Developers’ building …’ That’s correct.”

“Gerund?”

Rhyme: “It’s a verb used as a noun. ‘Running is good for you.’ Or so I’m told. A gerund takes the possessive. Is no one else aware of these rules? Astonishing.”

“Jesus, Linc, when your students make a little screwup on their papers, you give them shit like this?”

He frowned. “An F. Of course.” A nod toward the post on the screen. “The chat room’s anonymous. But the original email. Who sent it and how?”