A man called Chris Tapp has been in prison for 20 years for the death of Angie, but his DNA was never found at the crime scene. For Angie’s mother, Carol it doesn’t make sense, and she goes from initially calling for this man’s execution to being his greatest advocate. Carol then pushes the police to use a new technique of forensic genealogy. However, fears this new technique threaten both people’s right to privacy and their presumption of innocence begin to surface.

Meanwhile, Claire discovers that Australia started its own criminal DNA database following a mass DNA screening operation in rural New South Wales.

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