A brutally beaten woman is brought to a Stockholm hospital. Lidia Grayauskas, a native of Lithuania, is a prostitute - the police know nothing more about her. As soon as she comes to her senses, the girl takes hostages and threatens to blow up the hospital. On the same day, a militant from a mafia group commits a serious crime in the hospital. Many years ago, through his fault, the fiancee of Commissioner Grens received terrible injuries and lost her mind forever. Two investigations led by Grene suddenly converge at one climax. This is how a monstrous tangle of hatred, old enmity, humiliation, betrayal and revenge arises...