At just 14 years old Daniel Bartlam savagely killed his mother with a claw hammer and then sought to cover his tracks by setting fire to her body. Daniel's deep resentment of his mother following his parents' divorce rapidly led to dark and menacing behavior, and she was desperate to keep the problems behind closed doors, but did her love for him seal her fate?

Fred and Rosemary West raped, tortured, murdered and dismembered twelve young women including two of their daughtersin one of the most shocking cases of serial killing Britain has ever seen. But why did the Wests embark on their path of depravity? Were they born to kill, or did their mothers make them into monsters thanks to childhoods full of incest and abuse?

The case of Jed Allen, a young man who on the surface had a happy, stable life. Yet in May 2015 he would kill his mother, step-father and six year old half-sister in a brutal knife attack. MacIntyre and criminologist Dr Elizabeth Yardley explore Jed's dysfunctional childhood years with his mother to discover the trigger that led him to commit family annihilation.

Dr Harold Shipman, was Britain's most prolific serial killer with at least 215 known victims. Was Shipman simply addicted to murder, playing God by killing many of his elderly female patients with overdoses of morphine, or did his upbringing and the circumstances of his mother's death turn him into a mass murderer?

Joachim Knychala, the Polish serial killer who earned the ghoulish nickname 'Frankenstein,' attacked his victims with an axe, butchering and desecrating their bodies after death. MacIntyre and criminologist Dr Elizabeth Yardley explore Knychala's twisted relationship with his mother and grandmother to discover whether they were the cause of his murderous misogyny.