When a black-clad young man armed with a sword appears at the school in Trollhättan, people think it's a joke. Anton is a previously unpunished 19-year-old who suddenly commits a brutal mass murder.

On July 27, 2018, 28-year-old Johan Fallqvist decides to make his morbid fantasy come true - to stab a woman to death.

Bengt Karlsson was a popular night walker who was committed to women's safety. But behind the kind surface hid a sexually sadistic serial killer who had been preying on women his whole life.

A seemingly ordinary and happily married guy hits his wife in the head with a sledgehammer and throws her and their baby into Dalby Quarry. What made him so cold-bloodedly murder those closest to him?

Blacksmith Mikael Kittilä lives a double life. Outwardly, he meets women and works as a construction worker. He secretly dates gay men whom he ties up and tortures.

On September 20, 2014, Albin Aspgren steps into the police station and admits that he murdered and dismembered his female friend. The murder is completely inexplicable to those around them.

Martin Jonsson beat Lotta Rudholm to death in the summer of 2016. Twelve years earlier, he unprovokedly beat 30-year-old Niklas Westman to death. But how did Martin become a killer with an uncontrolled rage?