“So, Laing,” said Robin, trying to move Strike out of what seemed an uncomfortable reverie. “Remind me—?”

“Laing, yeah,” said Strike slowly.

She was right to think that he had been lost in thoughts of Brockbank. Now he forced himself to focus, to regroup.

“Well, Laing tied up his wife and used a knife on her; accused of rape twice that I know of, but never done for it—and he tried to bite half my face off in the boxing ring. Basically, a violent, devious bastard,” said Strike, “but, like I told you, his mother-in-law reckons he was ill when he got out of jail. She says he went to Gateshead, but he can’t have stayed there long if he was living in Corby with this woman in 2008,” he said, checking the map again for Lorraine MacNaughton’s road. “Right age, right time frame… we’ll see. If Lorraine’s not in, we’ll go back after five o’clock.”

Following Strike’s directions, Robin drove through the very center of Corby town, which proved to be a sprawl of concrete and brick dominated by a shopping center. A massive block of council offices, on which aerials bristled like iron moss, dominated the skyline. There was no central square, no ancient church and certainly no stilted, half-timbered grammar school. Corby had been planned to house its explosion of migrant workers in the 1940s and 1950s; many of the buildings had a cheerless, utilitarian air.

“Half the street names are Scottish,” said Robin as they passed Argyll Street and Montrose Street.

“Used to call it Little Scotland, didn’t they?” said Strike, noting a sign for Edinburgh House. He had heard that in its industrial heyday, Corby had had the largest Scottish population south of the border. Saltires and lions rampant fluttered from balconies of flats. “You can see why Laing might’ve felt more at home here than in Gateshead. Could’ve had contacts in the area.”

Five minutes later they found themselves in the old part of town, whose pretty stone buildings retained traces of the village that Corby had been before the steelworks arrived. Shortly afterwards they came upon Weldon Road, where Lorraine MacNaughton lived.

The houses stood in solid blocks of six, each pair a mirror image of the other, so that their front doors sat side by side and the layout of the windows was reversed. Carved into the stone lintel over each door was a name.

“That’s hers,” said Strike, pointing at Summerfield, which was twinned with Northfield.

Summerfield’s front garden had been covered in fine gravel. Northfield’s grass needed mowing, which reminded Robin of her own flat back in London.

“I think we’d both better go in,” Strike said, unbuckling his seatbelt. “She’ll probably be more comfortable with you there.”

The doorbell seemed to be out of order. Strike therefore rapped sharply on the door with his knuckles. An explosion of furious barking told them that the house had at least one living inhabitant. Then they heard a woman’s voice, angry but somehow ineffectual.