Douglas Henshall returns in the detective drama. Perez attends his mother's funeral on Fair Isle, where he begins to worry that his father is having trouble with his memory. However, when Tosh calls to inform him of a murder - the shooting of a prominent and controversial Shetlander on their doorstep in broad daylight - he rushes back to lead the investigation.

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 race is on to catch Sandy's attacker before he can escape Shetland, while Lynda Morton finds herself in trouble, so she desperately calls Perez for help - offering a key name for his investigation in return. Blood from the recent break-in throws up a DNA match that leads to another murder suspect, and a shocking confession causes tensions to boil over, sowing the seeds of further violence.

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