DI Shona Oliver is caught in the crosshairs of the National Crime Agency. They know she has information about the murder of her former boss and are determined to charge someone.

Shona is relocated to Galloway, where her higher ups think she'll draw less attention. She meets DI Kenneth Dalrymple, currently on compassionate leave to care for his terminally ill wife. He confides in Shona that his wife's dying wish is to learn who killed her sister. It's a case about as cold as it gets, but Shona agrees to help.

Only she hadn't banked on a fresh murder to investigate, or the chances of her being in the dock herself looking stronger by the day. Can she find answers and weather the storm?