In this two-part drama documentary, first-hand testimonies tell the story of one of the UK's largest murder investigations: hunting an unknown serial killer obsessed with abducting and murdering young girls. Left in the killer's wake are devastated families and a huge police inquiry piecing together the disturbing puzzle.

Featuring emotional accounts from parents who lost loved ones, interviews with officers who worked tirelessly for decades to crack the case, and taped interviews with the murderer himself – these two episodes offer a definitive overview into a series of chilling crimes that shocked the nation.