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DI Perez investigates the mysterious disappearance of a vulnerable young man.
As the search for Connor grows desperate, Perez follows Danny on a journey into his past.
Mounting evidence pushes Perez and the team to revise their view of Connor Cairns.
Perez issues a warrant for Connor's arrest and looks for the motive for his bomb-making.
Perez tries to get the measure of Lloyd. Evidence emerges of another bombmaker. The net closes in around Martin. Sandy uncovers Connor’s interest in a piece of local history.
The team races to identify the killer and prevent disaster striking Lerwick. As the investigation draws to a close, Perez faces a life-changing decision.
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