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.

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.