Carver deals with an unstable Major, and Dennett calls in a favour from Millikan Biotech. When the detective inspectors are assigned to a witness protection case with some familiar faces, Carver learns shocking truths and confronts Major.

Daniel Mays
DI John Major

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Stephen Graham
DI Roy Carver

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Anna Maxwell Martin
Kelly

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Rosie Cavaliero
Superintendent Dennett

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Guest stars