Unforgotten (2015)

S04E01 Episode 1

In a scrapyard, a gruesome discovery is made when a dismembered corpse is uncovered, leading the team to suspect the remains have been preserved in a household freezer for three decades. Simultaneously, Cassie grapples with a tough choice regarding her retirement from the police force after she discovers that she won't receive her complete pension unless she fulfills a full 30 years of service.