Ursula, Gareth and Alice have never met before. Ursula thinks she killed the love of her life. Gareth`s been receiving strange postcards. And Alice is being stalked. None of them are used to relying on others - but when the three strangers` lives unexpectedly collide, there`s only one thing for it: they have to stick together. Otherwise, one of them will die. Three strangers, two secrets, one terrifying evening. The million-copy bestseller returns with a gripping new novel that will keep you guessing until the end.