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Season 5, Episode 5: The Enemy Within: Part 5

When the body of a young woman who went missing eight years ago is found after an anonymous tip-off, the case is reopened and Gary makes a shocking discovery. Meanwhile, Jack finds a link to Martha's murder.

Season 5, Episode 6: The Enemy Within: Part 6

DS Alisha Brooks discovers that vital evidence in the Sarah Kramer case has gone missing. Meanwhile, the team tries to find evidence against corrupt DCI Drummond, but as the net closes in on him, he becomes increasingly desperate.