DI Jimmy Perez and his team investigate crimes within the close knit island community of Shetland.
Cast: Douglas Henshall, Alison O'Donnell, Steven Robertson, Erin Armstrong, Mark Bonnar, Julie Graham, Lewis Howden, Anne Kidd
Calder and Tosh turn their focus onto Lisa, until her confession unearths a shocking event and leads the team back to Annie's inner circle.
Calder and Tosh discover the truth behind Rossi's mission. They must identify Annie's killer before he can exact his revenge.
The team uncovers the sinister truth behind the facility. But the investigation is diverted when Astrid Jakobson goes missing.
As Calder and Tosh wrestle with the revelation of Annie's past, Noah offers a cryptic clue about the night she was killed.
The hunt is on for Ian Bett as a picture of Anton Bergen begins to emerge. Are Calder and Tosh dealing with the revenge of a jealous ex-husband?
Tosh suspects something is seriously wrong when her friend, Annie Bett, goes missing. Calder has no time to recover from a life-threatening ordeal of her own, as together they set out in search of Annie and her young son, Noah.