“And what are you sorry for?” Half a dozen people, all of them bowed and gray-haired, trooped by, walked slowly down the steps and vanished into the crowd that streamed past.

“You mean, apart from your church getting shot up? I’ve met the bosses of both sides: neither of them seemed too bothered about carrying on a gun-battle on holy ground. I guess you could call them yourself if you want, see if you have any luck in screwing them for some compensation.”

“Blood money, Petrovitch.” Father John wiped one sweaty palm across the other. “You do understand the concept, don’t you?”

“Yeah,” said Petrovitch with a snort. “Yeah, I do.”

“You said, apart from.” A shadow fell across the priest from behind Petrovitch. “Why are you really here?”

He looked up at Sister Madeleine, and his heart did that thing that might have been a software glitch. “I lied to you,” said Petrovitch. “Or rather, I didn’t tell you the truth.”

The sister frowned down at him, trying to remember. “Which bit?”

“All of it. But that’s not important right now. Ask me again. Ask me again why I did what I did, and I’ll tell you.”

She glanced over at Father John, covered in confusion. “He’s the priest. If you want to confess…”

“No,” said Petrovitch. “I’m not confessing. I’m not ashamed of what I’ve done.”

“Then what the hell are you talking about?”

Her choice of language startled him, he who used the most obscene insults imaginable. He pushed his glasses back up his nose to buy him some time. “I just wanted you to know that sometimes the people you hate most can change for the better.”

“I don’t hate you,” she said, equally startled. “Why would I hate you? I…”

“You will do. Go on: ask me,” he dared her.

“Excuse me,” said the father, but Petrovitch and Madeleine were staring so intensely at each other that his presence was forgotten.

“Why did you help her?”

“Because I used to be part of a gang that kidnapped people for ransom, and I didn’t want to see it happen ever again.”

Sister Madeleine’s eyes were wide open. “You?”

“Thanks. I was hoping that it wouldn’t be too hard to believe.” He adjusted his bag. “Forget about me. You won’t see me again.”

He started off down the steps, quicker than he ought. She called after him.

“Petrovitch, where are you going?”

He almost stopped. His feet dragged on the pavement. Then he picked up speed again and vanished into the crowd.

Vast, anonymous and brooding, the Regent’s Park domiks grew closer as he walked down the Marylebone Road. Petrovitch put a determined smile on his face. Even without the rat, the plan he had was pretty damn good.