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When the body of a policewoman missing for a year is pulled from the Thames, Boyd and the team discover that she was being followed by two stalkers.
Who else was present at the time of the murders? Boyd suspects Keel is covering for someone and forces her to revisit that fateful night in 1975.
The team tracks down Debbie's married lover, but he denies killing her. Meanwhile, stalker Chris Redford is ready to confess, but Grace is not convinced he's the guilty man.