'I just wondered,' the girl was saying, 'if you knew anything about it. I mean, if it's true. I mean, if it is…' she sighed.' Poor Beggar.',

Rebus frowned now.

'That's his nickname,' she explained. 'Beggar. That's what Ronald calls him.'

'Your boss knows Mr Jack then?'

'Oh yes, they were at school together. Beggar owns half of this. She waved a hand around her, as though she were proprietress of some Princes Street department store. She saw that the policeman didn't seem impressed. 'We do a lot of business behind the scenes,' she said defensively. 'A lot of buying and selling. It might not look much, but this place is a goldmine.'

Rebus nodded. 'Actually,' he said, 'now that you mention it, it does look a bit like a mine.' His wrist was crackling now, as though stung by nettles. Bloody cat. 'Right, keep an eye out for those books, won't you?'

She didn't answer. Hurt, he didn't doubt, by the 'mine' jibe. She was opening a book, ready to pencil in a price. Rebus nodded to himself, walked to the door, and rubbed his feet noisily on the mat before leaving the shop. The cat was back in the window, licking its tail.

'Fuck you too, pal,' muttered Rebus. Pets, after all, were his pet hate.

Dr Patience Aitken had pets. Too many pets. Tiny tropical fish… a tame hedgehog in the back garden… two budgies in a cage in the living room… and, yes, a cat. A stray which, to Rebus's relief, still liked to spend much of its time on the prowl. It was a tortoiseshell and it was called Lucky.

It liked Rebus.

'It's funny,' Patience had said, 'how they always seem to go for the people who don't like them, don't want them, or are allergic to them. Don't ask me why.'

As she said this, Lucky was climbing across Rebus's shoulders. He snarled and shrugged it off. It fell to the floor, landing on its feet.

'You've got to have patience, John.'