The Devil Knows

Few have attracted such notoriety or public loathing as the Moors murderers who kidnapped and murdered five children.
Myra Hindley was obsessed with Ian Brady, and he loved the idea of being worshipped and adored. He decided to include her in his plans for a crime spree.
They began a perverse love affair which included taking explicit photos of each other. But this was not enough so their interest turned to kidnapping, child molestation and murder.
Were they born monsters or did they develop into monsters because of their sadistic relationship?