Overview: Professor Leif GW Persson investigates the yet unsolved murder of Nils Bergman in Skärholmen, 2002. Camilla Kvartoft visits Swedish Forencics Laboratory (SKL) and gets the full story on analysis of fires and how to discover insurance fraud as well as arsonists. Topic for this episode's historical case are the Börstig arsons which occurred during the 1960's.