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Episode 5: Dr. Marr's secrets and those of the McGrellish family are revealed and Evie finds out the truth of what's happened to her friend Bethan McGrellish - it is not what she expected. Just as the police think events at the dam have brought the case to a close the underwater drone on Alan's boat makes a huge discovery.

Starring: Laura Fraser, Siobhan Finneran, Don Gilet.