Megan Pritchard is reported missing during a party in an isolated house in the Vale of Glamorgan. A short time afterwards, her body is found. It looks like an accident, the result of consuming too much alcohol. But DI Mandy Wilde is suspicious. And Megan's friends are hiding something. As Mandy and the team dig deeper, they uncover a catalogue of secrets, and reasons why being friends with Megan could be difficult. A series of disturbing activities come to light, adding lies, blackmail and trolling to a complex murder investigation.