Two guys walk along Söder Mälarstrand in Stockholm. The quay is filled with boats. Then they see something that looks like a corpse. It later turns out to be a torso of a male body. Now the investigation into who the man is starts.
A family on a car trip to Björkviks Brygga discovers a naked woman in the water. And the woman is Melissa, a 22-year-old fashion model with big dreams for the future and hope for a good life.
A woman is murdered in her apartment in Gävle. And in the vast majority of cases, the partner is to blame. He is also for a long time the main track. But when DNA is tested, the investigation takes a decisive turn.
During the winter, Gunilla chooses to take in a boarder whom we have chosen to call Kennet. And life with him as a tenant wears away at Gunilla. His computer gaming all night becomes too much. She wants him out. Then Gunilla disappears.
Ten-year-old Bobby is reported missing at the shopping center in Bäckebol in Hisingen by the child's parents. A large police operation is launched with no luck. No Bobby. So the police are beginning to feel uneasy
18-year-old Julia goes out in the evening to buy bread at the nearby deli at home in Höganäs. She's never coming back. What could have happened to Julia? Just over an hour later, a passer-by finds Julia unconscious behind a garden hedge.
Just before seven in the morning, an alarm comes from a jogger. She has found two dead bodies. It soon turns out that the woman also finds another victim in a car. So the police now have a triple murder to investigate.
With the help of DNA at the murder scene, the investigators get closer to a solution around a double homicide. But when the time comes for the trial, something happens that makes both the defense and the prosecutor to appeal the verdict.
DNA plays an increasingly important role in criminal investigations. Research is moving forward, but there are still pitfalls. Hasse Aro tells about five different cases where DNA played a decisive role.