All six episodes from the fourth series of the Scottish crime drama based on the novels by Ann Cleeves. Set in the Shetland Islands, the programme follows Detective Inspector Jimmy Perez (Douglas Henshall) as he works to solve a number of murder mysteries. He is assisted by Detective Sergeant Alison 'Tosh' Macintosh (Alison O'Donnell) and Detective Constable Sandy Wilson (Steven Robertson). The cast also includes Erin Armstrong, Mark Bonnar and Julie Graham.