Late at night, a doctor burns to death inside the closed forensic psychiatric institution Helix. The interrogations with staff and inmates are complicated due to patient confidentiality and psychotic illnesses. After another death in the same ward, Saga Bauer accepts a top-secret assignment. She is placed as a patient among the most dangerous perpetrators in Sweden. Joona Linna is Saga Bauer’s only contact on the outside. The Queen hiding in the ward turns out to have a court of subjects – and she leaves victims behind at a faster rate than any serial killer has ever done before.

Medusa is the eleventh book in the Joona Linna series.