A brutal act and a single witness whose sick memory refuses to reveal the truth. The return of the hypnotist in Commissioner Joona Linna's eighth case. Sixteen-year-old Jenny disappears on her way home from school. Five years later, her body appears on a playground in central Stockholm. The perpetrator hanged the girl in a particularly cruel way — he pulled her onto a children's climbing frame on a steel rope. Who can do such a thing? Joona Linna embarks on an investigation with vigor. He senses that Jenny may not be the only one. Thanks to security cameras, the police manage to find an eyewitness, but it turns out to be a mentally ill man. He doesn't remember anything at all from what he saw. Joona therefore reunites with the hypnotist Erika Maria Bark. Will she help him uncover the truth?