Jack Haynes rings his wife's missing phone, but when he remembers seeing it downstairs earlier in the kitchen, he goes to hang up, only for it to be answered by strangers who've broken into the house. The strangers are looking for something specific, something which involves his daughter, Lucy, who's witnessed a murder the night before in the woods. But will they find something else - will they find Jack's biggest secret? Jack finds a small, old leather box in the cupboard in the corner of Lucy's bedroom, containing something inside. When he finally opens it, he uncovers secrets worse than he can ever begin to imagine. Secrets that will rip his life apart.