In view of Wardle’s increasing restlessness, Strike passed no comment except to suggest that they both adjourn to the pavement for a cigarette.

They lit up and smoked side by side for a couple of minutes. Workers walked past in both directions, weary from late hours at the office. Evening was drawing in. Directly above them, between the indigo of approaching night and the neon coral of the setting sun, was a narrow stretch of no-colored sky, of vapid and empty air.

“Christ, I’ve missed this,” said Wardle, dragging on the cigarette as though it was mother’s milk before picking up the thread of their conversation once more. “Yeah, so Brockbank was in church that weekend, making himself useful. Very good with the kids, apparently.”

“I’ll bet he is,” muttered Strike.

“Take some nerve, though, wouldn’t it?” said Wardle, blowing smoke towards the opposite side of the road, his eyes on Epstein’s sculpture Day, which adorned the old London Transport offices. A boy stood before a throned man, his body contorted so that he both managed to embrace the king behind him and display his own penis to onlookers. “To kill and dismember a girl, then turn up in church as though nothing had happened?”

“Are you Catholic?” Strike asked.

Wardle looked startled.

“I am, as it goes,” he said suspiciously. “Why?”

Strike shook his head, smiling slightly.

“I know a psycho wouldn’t care,” said Wardle with a trace of defensiveness. “I’m just saying… anyway, we’ve got people trying to find out where he’s living now. If it’s a council house, and assuming Alyssa Vincent’s her real name, it shouldn’t be too difficult.”

“Great,” said Strike. The police had resources that he and Robin could not match; perhaps now, at last, some definitive information would be forthcoming. “What about Laing?”

“Ah,” said Wardle, grinding out his first cigarette and immediately lighting another, “we’ve got more on him. He’s been living alone in Wollaston Close for eighteen months now. Survives on disability benefits. He had a chest infection over the weekend of the second and third and his friend Dickie came in to help him out. He couldn’t get to the shops.”

“That’s bloody convenient,” said Strike.

“Or genuine,” said Wardle. “We checked with Dickie and he confirmed everything Laing told us.”

“Was Laing surprised the police were asking about his movements?”

“Seemed pretty taken aback at first.”

“Did he let you in the flat?”

“Didn’t arise. We met him crossing the car park on his sticks and we ended up talking to him in a local café.”

“That Ecuadorian place in a tunnel?”

Wardle subjected Strike to a hard stare that the detective returned with equanimity.

“You’ve been staking him out as well, have you? Don’t mess this up for us, Strike. We’re on it.”

Strike might have responded that it had taken press scrutiny and the failure to make anything of his preferred leads to make Wardle commit serious resources to the tracking of Strike’s three suspects. He chose to hold his silence.