Nigel never meant for it to happen. At first, he just wanted to be Matt's friend. But when he discovers he can hear what is going on in the flat below him, his fascination with his new neighbour drifts into obsession. Rearranging his furniture to recreate the layout of the rooms downstairs. Buying the same clothes, going through Matt's post, his things. Becoming Matt without him ever knowing. And it would have been all right, if Matt hadn't brought the girl home. When things spiral out of control, Detective Inspector Harland has to unravel the disturbing truth...