You're living with a stranger. It's your daughter. Following a whirlwind romance, Rose and Chris's marriage has been unshakeable for twenty years. But when Katie turns up on their doorstep, blonde, wide-eyed and beautiful, their perfect life threatens to crumble to pieces. Because Katie says she's Chris's long-lost daughter, the product of a forgotten summer fling. Kind-hearted Rose invites Katie to stay, despite Chris's protests. The poor girl has only just lost her mother - they can't leave her out on the street. But soon after Katie moves in, strange things start happening. Someone crashes into a neighbour's fence. An unexplained fire starts in the couple's kitchen. And a family friend coming to visit disappears on the way to the house. Chris insists Katie has to go. But it's Chris who won't explain where he was at the time their friend went missing... The couple's dream life seems to be turning into a nightmare. With dark secrets about Chris's history with Katie's mother coming to light, Rose no longer knows who to trust. Soon, she isn't sure whether she's invited a dangerous stranger into her home, or whether she's been living with one all along... A chilling thriller that will make you question everything you think you know about your loved ones. Fans of The Woman in the Window, Then She Was Gone and The Perfect Child won't be able to put this book down.