Rebus shrugged, saying nothing.

‘You want me to place it?’

Another shrug.

‘Why?’

Rebus stared at the empty mug in his hands. Why? Because once it was public knowledge, the caller would have failed, at least in his or her own terms. And, having failed, maybe they’d feel compelled to try something else. If they did, Rebus would be ready . . .

Kemp was nodding. ‘Okay, thanks. I’ll think it over.’

Rebus nodded too. He was already regretting the decision to tell Kemp. The man was a reporter, and one with a reputation to make. There was no way of knowing what he’d do with the story. It could be twisted to make Jack sound like Samaritan or slime . . .

‘Meantime,’ Kemp was saying, rising from his chair, ‘I better take a bath if I’m going to make that meeting . . .

‘Right.’ Rebus rose, too, and placed his mug in the sink. ‘Thanks for the coffee.’

‘Thanks for the milk.’

The bathroom was on the way to the front door. Rebus made show of looking at his watch. ‘Go get into your bath,’ he said. ‘I’ll let myself out.’

‘Bye then.’

‘See you, Chris.’ He walked to the door, checking that his weight on the floorboards did not make them creak, then glanced round and saw that Kemp had disappeared into the bathroom. Water started splashing. Gently, Rebus turned the snib and locked it at the off position. Then he opened the door and slammed it noisily behind him. He stood in the stairwell, pulling the door by its handle so that it couldn’t swing back open. There was a spy-hole, but he kept himself tucked in against the wall. Anyway, if Kemp came to the door he’d notice the snib was off . . . A minute passed. Nobody came to the door. More fortuitously, perhaps, nobody came into the stairwell. He didn’t fancy explaining what he was doing standing there holding on to a door handle. . .

After two minutes, he crouched down and opened the letter box, peering in. The bathroom door was slightly ajar. The water was still running, but he could hear Kemp humming, then a-ha-hee-ha-ing as he got into the bath. The water continued to run, giving the noise-cover he needed. He opened the door quietly, slipped back indoors, and closed it, jamming it shut with a hardback book from the top of one of the stacks. The remaining books looked as though they might topple, but they steadied again. Rebus exhaled and crept along the corridor, past the door. Taps pouring . . . Kemp still humming. This part was easy; getting back out would be the hard part, if he had nothing to show for the deception.