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While investigating a murder, DI Emma Crane and DI Tom Radley uncover serious misconduct within Wakestead Police Station.

Emma's discovery of shocking video evidence leads to an unexpected breakthrough in the case, and she has no choice but to turn on one of her own.

With a key suspect exonerated, Emma is unable to shake her suspicion that a serial predator is operating within Wakestead Police Station.

Emma uncovers a potential lead to Sophie's killer as a link to another victim is discovered.

A suspect is brought in for questioning. Emma seeks help from an unlikely ally to bring her one step closer to Sophie's killer.

Things come to a head when the identity of the serial abuser is finally revealed, but Emma uncovers a further clue, forcing a devastating confrontation.