Best friends Hollie and Niamh tell each other everything. Behind the village of Abingworth's closed doors, every family has its secrets - and their doors might hide the worst ones of all. One day Hollie tells Niamh about a devastating discovery, swears her to secrecy, then vanishes. The villagers claim to know nothing. But when Hollie's body is found, the police know one of their number isn't just a liar, but a killer... What did Holly tell Niamh before she died? And who would kill to keep it hidden? After all, two can keep a secret - if one of them is dead...