When a sailor is found dead on submarine HMS Vigil, DCI Silva uncovers a conspiracy.
The submarine is left exposed by a reactor shutdown, and the crew races to repair the fault. Kirsten uncovers a feud on board the Vigil, leading Amy to question whether her investigation has been deliberately obstructed.
Kirsten uncovers evidence suggesting the murders were part of a coordinated attack. Her investigation takes her into the heart of Scottish politics, and the Naval cover up of a near catastrophe in the US.
Amy confronts one of the crew with her discoveries about their deception, but with her mental health suffering, questions are asked about her fitness to investigate.
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