In the devastating finale, the investigation of a schoolgirl's brutal murder takes its toll on the battle-scarred detective.

As she struggles with her own demons, Jane Tennison (Helen Mirren) tackles her last case. Drink, loneliness and the grueling life of a crime fighter are finally catching up with Detective Superintendent Jane Tennison, now clinging to her career so that she can solve one last heartbreaking homicide.
Can Tennison keep body and soul together as events spiral into a nightmare of unimagined evil?
Friday at 9:30 p.m. on PBS-HD.
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