The Island

PC Kat Crichton confronts her past when assigned to a murder case on the Isle of Harris.

Kat fights to gather evidence against Sir Douglas, but new revelations change everything.

With the evidence at the sheiling matching Sir Douglas' new account of the night, DCI Halim is set on wrapping up the case, but Kat can't let her theory go. Sir Douglas is convincing, but Kat is sure it isn't the full story.

With her career hanging in the balance, it's Kat's last chance to catch Mary's killer.