John Buick

To set things right, Alfie and Daveboy search for a dangerous secret prison in the Hebrides, which generates its power by triggering its inhabitants’ most traumatic memories.

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.

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.

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