Carl and Akram recreate the fateful ferry journey on their way to the Isle of Mhòr. A frustrated Rose makes her case for joining their Department.

Rose goes to the island to find out what Carl couldn't. Akram finds a note which sends the investigation in an entirely new direction.

The prosecutor's disappearance becomes connected with a death. A scuffle in a newspaper office sees Carl making headlines, and Moira sees a therapist.