Instinct (2007)

Part 2 (1x2)

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D.C.I. Thomas Flynn closes in on the serial killer when a fifth body is found hanging from a fence, and finds his life becoming entwined with that of Ian Stanford, the first victim's husband. The detective's concern for half-sister Milly grows when she reveals she's joined a dating agency - with neither of them realising she's part of the murderer's deadly plan.