Between 1963 and 1965, Ian Brady and Myra Hindley murdered five young people in and around Greater Manchester.
Three of the victims were children.
The crimes became known as the Moors Murders, and the bleak landscape of Saddleworth Moor became inseparable from their story.
In 1966, Brady and Hindley were convicted of three murders. Years later, they admitted responsibility for two additional victims: Pauline Reade and Keith Bennett. Reade's remains were eventually recovered, but Keith Bennett's have never been found.
For decades, the case has raised questions that go beyond the murders themselves.
How did Brady and Hindley become involved in the killings?
What role did each of them play?
Why did Hindley spend years maintaining that her involvement was less extensive than prosecutors claimed?
And why has the search for Keith Bennett continued long after both killers died?
The case also became a landmark in the history of British true crime not only because of the brutality of the murders, but because of the way the media, the courts and the public responded to them.
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