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.

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

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.