The last person you need to protect your daughter from is her closest friend...isn't it? Abi Holland just can't help but worry about her youngest daughter Beth. So when foreign exchange student Corinne comes to stay, it's a relief her lonely daughter finally has someone to talk to. It's only when Beth starts to misbehave, that Abi begins to wonder how much they really know about their guest. The gripping new psychological thriller from the bestselling author of 'Girl Unknown'.