The case of 10-year-old Mary Bell who strangled toddlers, a playground plot that ended in murder and a teenage passion that turned to bloody rage.

A businesswoman kills for cash, a bizarre love affair ends in slaughter, and a midwife becomes a cold-blooded murderer.

The crimes of psychopathic killers, including a nurse who betrayed a patient's trust to indulge her deadly desires, and a brutal babysitter.

Looking at killers who hid their instability, including an outgoing hiding dark secrets at home, and two old ladies behind a horrific murder.

Examining crimes of passion, including an office affair that turned toxic and a lover who used the Internet as a murder weapon.

A woman boards a train with a grisly secret in her luggage, an active imagination causes a gruesome crime, and a seductress moves from men to murder.

How Charles Manson drove women to murder, exploring Myra Hindley's past, and why a young mother was persuaded to kill.

How a woman took a baby from an expectant mother's womb, two girls killed to protect their friendship, and a killer committed her crimes for a serial murderer she loved.

A sex-obsessed housewife who lured girls to their graves, a couple who took pleasure in killing, and a woman who swapped single motherhood for a violent relationship.

A mother who smothered her baby, a woman who drowned the sons she believed made her unhappy, and how another who was driven by delusions to destroy her family.

A promiscuous housewife who murdered her husband, a woman who tortured her lodger to death, and a police officer who took a child on a killing spree.

A wronged wife who murdered her ex-husband, a jealous girlfriend who took revenge on her rival, and a girl who killed her own father.

A mother who manipulated her son into committing murder, a woman who made a deadly request of her children, and a daughter who was used as a lure for a family business.