Episode 1 (S05E01)

Strike is approached by a distressed woman seeking assistance in locating her mother, Margot Bamborough, who vanished in 1974 amidst a terrifying wave of murders committed by a psychopathic serial killer. The case, shrouded in mystery and darkness, compels Strike to delve into the past and uncover the truth surrounding Margot's disappearance, while navigating the chilling remnants of the killer's reign of terror.