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Returning from a Swiss business trip, executive Mark Bretherick finds the dead bodies of his wife Geraldine and daughter in the bathtub. It looks like a suicide, but there's no note or known motive. Country police chief Proust gives the case to recent London transferee, detective sergeant Charlie Zailer. Lacking confidence, she ignores the advice of veteran DC Simon Waterhouse, imagining a conspiracy. Bretherick gets a visit from a strange woman who claims to have had an affair with a man using Mark's name.
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Episode 1
47 mins
Ruth Blacksmith prepares to divorce estranged husband Jason to marry the younger Aidan Harper,despite Aidan's confession that he once 'hurt a woman,who later died',named Mary Trelease. Unbeknown to Ruth Jason and Aidan had fought and now Jason is found murdered,his sister suspecting Aidan,who has no alibi. Aidan is also evasive when Ruth questions him about Mary so she follows him and sees him embrace another woman,after which he flees. Returning to their house Ruth locks him out when he comes after her but forensic evidence leads Charlie to arresting Ruth as the killer.