An unhappily married, eminent scientist embarks on a passionate affair without a clue of her lover's true identity.
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New Series: A scientist begins to suspect more is at play after an affair with an enigmatic stranger.
Dr Yvonne Carmichael is pushed to her limits, and turns to a former lover for advice.
Yvonne's life is turned upside down yet again, when she is ripped away from her family, and arrested for the murder of George Selway.
Season Final: The murder trial continues, with Costley's defence resting on evidence of an underlying personality disorder. Costley's back is up against the wall; has he reached his tipping point?