Mia Cosgrove is a high-flying psychotherapist with a thriving practice, but when she receives a desperate phone call from her oldest friend, Lysette, she puts her life on hold to rush to her side. A friend of Lysette's, Sarah, has plunged to her death from the top of a multi-storey car park, an unsent text message on her phone, simply saying ‘I'm sorry x.' At first the police are convinced it's a suicide, but as more deaths rock the rural community, the police aren't so certain…