S04E04 Episode #4.4
Crime, Drama, Mistério
Jimmy and Alison learn that Soderlund is an undercover agent working to expose the NDA for the Norwegian secret service but when they find him his cover has been blown and he has been killed. They return to Shetland for Sally's memorial service where Kate and Tommy's affair is revealed and he is still a suspect. Another resident, Jo, is found to have been enamoured of Alan whilst Alison receives a welcome visitor and another crime is reported.