A must-read for fans of Clare Mackintosh and Paula Hawkins.`Sophie Hannah is genuinely Christie`s heir` The Scotsman`Hugely entertaining, full of uncomfortable truths` London Evening StandardWhat if having a best friend was the most dangerous thing you could do?A killer that the police are calling `Billy Dead Mates` is murdering pairs of best friends, one by one. Before they die, each victim is given a small white book... For months, detectives have failed to catch Billy, or work out what the white books mean. And then a woman, scared by what she`s seen on the news, comes forward.Stand-up comedian Kim Tribbeck has one of Billy`s peculiar little books. A stranger gave it to her at a gig she did a year ago. Was he Billy, and does he want to kill her? Kim has no friends and trusts no one, so how - and why - could she possibly be Billy Dead Mates` next target?This is the next chilling novel from the queen of psychological crime - a literary puzzle set to unlock the dark side of the mind . . .