Shetland

Perez and Tosh board the dive boat to investigate this latest death. Was this a tragic accident, or was the only witness to Galbraith's murder silenced before they could speak? Suspicion falls on Mick Muir, the Life Support Supervisor responsible for diver safety - and when he is attacked by angry crew members, he has to be rushed to hospital. Perez senses the hand of organized crime, but getting answers proves difficult.

The hunt is on for Sandy’s attacker, before a shocking confession causes tensions to boil over and some Islanders take justice into their own hands.

After the shocking events of the previous night, Perez must piece together what happened before a rampaging and vengeful Creggan finds his target.

Facing a dead end in the hunt for Galbraith’s killer, Tosh leads Perez to the remote island of Fetlar. Donna asks Duncan for one last favour.

As Perez closes in on the identity of Galbraith's killer, he struggles with Duncan's secret, while Donna has one more surprise in store.