In the season premiere, we examine Kjell-Åke Johansson, one of Sweden's worst sadists of all time. Over the course of several months, he tortures a woman on a farm in Aspa outside Örebro so severely that she finally dies. But it's not the first time.

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.