On a summer day in June 2017, Edvin Gyllensvaan tapes an elderly couple to two kitchen chairs and cuts their throats. The previously unpunished father of young children is an enigma to the police.

Mikael Hagelin is only 17 years old when he kills his mother with forty stab wounds. After four years of youth care, he meets the girl of his dreams. It won't be long before Mikael also stabs his partner to death.

The Långshyttan murder became one of Sweden's most noticed cases in 2016, when a group of eleven people together plan and carry out the murder of 61-year-old Madeleine. During an excursion, they strangle Madeleine in the back seat of the car and then she is stabbed to death.