Tucking her little boy Ollie into bed one night, Sarah notices his beloved teddy bear, which she bought him when he was born, is missing and in its place is a new toy given to him by her ex-husband's new girlfriend, Laura. When she asks Ollie about it, he begins to shift uncomfortably, before whispering 'Laura told me a big secret and she said I can never tell you'. Sarah's heart sinks. But when she raises her concerns, nobody wants to listen. To everyone else, Laura is the perfect stepmother and Sarah is just the jealous ex-wife. But Sarah knew the moment she met Laura she couldn't trust her, from her overly perfect stepmother act to the way she evaded questions about her own history. Soon Ollie is asking to spend more time with his dad and Laura, and shrinking away from Sarah. Then, when she calls to him in the garden one day, Ollie doesn't answer back. The garden is silent. Ollie's sandpit is empty. Ollie has disappeared.