Season 4

Thomas and Mia try to track down all of the marine commandos who have come up in the investigation. Meanwhile, they find out that Officer Cronwall is missing.

Thomas and Mia continue their investigation. Marcus Nielsen, who studied psychology, had scheduled several meetings with former Marine Commandos.

The idyllic summer tranquility of Sandhamn is shattered when a student, Marcus Nielsen, is found dead. Everything indicates suicide. His mother can't believe that he would take his own life.