For over 20 years, sex killer Joachim Kroll had been strangling women across northern Germany. He claimed an internal force drove him, picking women walking alone in the countryside. Many were strangled with their own clothes. Then he molested them. As his killing spree increased, he started to target younger and younger victims. But even this didn't satisfy him. He killed and cooked a cat, which only drove his desire to taste human flesh. His demons overpowered him into killing, dissecting and then eating a neighbour's 4-year-old daughter. But when he was unable to dispose of the evidence, he was picked up by the police. He was charged with 12 murders but admitted to 30, making him Germany's most prolific killer in decades.

When a body is found trussed up in the River Odra in western Poland, the police are baffled. The man has been starved and tortured, before being thrown alive into the river. It has all the hallmarks of a punishment beating. The murder investigation stalls until police discover an online murder story written by a Krystian Bala that bears similarities to the death of the man in the river. Bala has even published a book, an explicit cocktail of murder and pornography. Bala becomes the prime suspect

The story of Joel Rifkin, a self-employed landscape gardener from East Meadow, Long Island, who murdered and dismembered 17 prostitutes during the late 1980s and early 1990s.

Fritz Honka quietly lived in Hamburg's red light district of St Pauli, picking up elderly prostitutes for the price of a glass of schnapps and a bed for the night. He began to lose his temper when the women declined his sexual perversions. He retaliated by strangling his victims. Disposing of the bodies presented a problem until he came up with the idea of dismembering them and storing the body parts in the roof space next to his flat. Had a freak house fire not crept up the building to expose his collection he might never have been caught. He claimed he had been instructed by London's Victorian Jack The Ripper to perform the murders. He was sectioned at a mental institute after being convicted of 1 murder and 4 manslaughters.

For two years the baby-faced killer Karol Kot terrorised the Polish city of Krakow. Unlike many serial killers he appeared to have no fixed modus operandi when targeting his victims, which made tracking him down difficult. He began his attacks on elderly women, but after a two-year break, he moved to attacking children. An 11 year old boy is found stabbed to death: the boy's internal organs have been punctured in the frenzied attack. A young girl is targeted shortly afterwards. Witness statements link a schoolboy with the crimes. The country is horrified. The killer is finally caught when he confides in a potential partner. His attempt to impress her backfires. Instead she's horrified and goes straight to the police. Once in custody, the schoolboy Kot reveals he drank the blood of his victims as they lay dying.

When police see a car weaving between lanes on a Californian highway late one night, they pull the car over. In the driver's seat is Randy Kraft. In the passenger seat is a dead body. In the boot is a list of names, and under the seat is a collection of photos of what look like dead bodies on a sofa. A former military airman, Kraft targeted marines and gay men, routinely sodomising and emasculating them before he killed them. The torture his victims endured became more and more extreme. A computer programmer with a high IQ, Kraft to this day maintains his innocence and despite the extensive evidence against him, denies killing anyone. He is currently appealing his death sentence in the Federal courts. Kraft now sits on Death Row in the infamous San Quentin prison, convicted of 16 counts of murder. Known as the "Scorecard Killer" because of a piece of paper he kept believed to be a death list of victims, conservative estimates allege he has killed at least 50 more. Others put his total body count at over 100.

Police are stunned when they attend the scene of a multiple murder at the Alabama Institute for the Deaf and Blind. Five victims; all strangled within the space of twenty-four hours. So begins a manhunt to catch violent Serial Killer, Daniel Lee Siebert.

When police discover the body of a vagrant, they dismiss it as just another ‘Skid Row’ killing. But when they find a second corpse, then a third, they quickly realise they are dealing with a machete wielding maniac… who won’t stop until he’s caught.

A sadistic trucker roams the highways in his mobile torture chamber, hunting for victims. Once they’re under his control, he brutalises and then kills them. But an illegally parked vehicle will prove his downfall…

In a quiet coastal community a brutal murderer stalks and kills at random. The police investigation will uncover a hidden world of sadomasochism, double identities and the most terrifying killer of all - a pitiless psychopath hiding in plain sight.

From the criminal underbelly of a rural town, a sadistic psychopath leaves a trail of destruction. As police discover a wave of vicious murders, investigators rush to track down the culprit. But this killer doesn’t fit any profile they’ve ever seen.

A rural Louisiana community is stunned when police begin to discover the corpses of young, seemingly fit and healthy men. Serial killer, Ronald Dominique stalks the bayous and canals around the town of Houma and it’s down to investigators to catch him.