“Is she still trying to hide you from her ex?” asked Ilsa, a faint sting in the inquiry.

“Don’t like Elin, do you?” said Strike, taking the discussion unexpectedly into the enemy camp for his own amusement. He had known Ilsa on and off for thirty years: her flustered denial was exactly what he had expected.

“I do like—I mean, I don’t really know her, but she seems—anyway, you’re happy, that’s what counts.”

He had thought that this would be sufficient to make Ilsa drop the subject of Robin—she was not the first of his friends to say that he and Robin got on so well, wasn’t there a possibility…? Hadn’t he ever considered…?—but Ilsa was a lawyer and not easily scared away from pursuing a line of questioning.

“Robin postponed her wedding, didn’t she? Have they set a new—?”

“Yep,” said Strike. “Second of July. She’s taking a long weekend to go back to Yorkshire and—do whatever you do for weddings. Coming back on Tuesday.”

He had been Matthew’s unlikely ally in insisting that Robin take Friday and Monday off, relieved to think that she would be two hundred and fifty miles away in her family home. She had been deeply disappointed that she would not be able to come along to the Old Blue Last in Shoreditch and meet Wardle, but Strike thought he had detected a faint trace of relief at the idea of a break.

Ilsa looked slightly aggrieved at the news that Robin still intended to marry someone other than Strike, but before she could say anything else Strike’s mobile buzzed in his pocket. It was Graham Hardacre, his old SIB colleague.

“Sorry,” he told Nick and Ilsa, setting down his plate of curry and standing up, “got to take this, important—Hardy!”

“Can you talk, Oggy?” asked Hardacre, as Strike headed back to the front door.

“I can now,” said Strike, reaching the end of the short garden path in three strides and stepping out into the dark street to walk and smoke. “What’ve you got for me?”

“To be honest,” said Hardacre, who sounded stressed, “it’d be a big help if you came up here and had a look, mate. I’ve got a Warrant Officer who’s a real pain in the arse. We didn’t get off on the right foot. If I start sending stuff out of here and she gets wind of it—”

“And if I come up?”

“Make it early in the morning and I could leave stuff open on the computer. Carelessly, y’know?”

Hardacre had previously shared information with Strike that, strictly speaking, he ought not to have done. He had only just moved to 35 Section: Strike was not surprised that he did not want to jeopardize his position.

The detective crossed the road, sat down on the low garden wall of the house opposite, lit a cigarette and asked: “Would it be worth coming up to Scotland for?”

“Depends what you want.”

“Old addresses—family connections—medical and psychiatric records couldn’t hurt. Brockbank was invalided out, what was it, 2003?”