A charming young girl, Armi, is brutally murdered, and the police, believing that the crime was committed for sexual reasons, arrest her fiance Kimmo. All the evidence points to him. No one believes in his innocence - except for Maria Kallio, who left the police, but retained her intuition and talent as a detective. She suspects that Armie's murder is connected with another tragedy that shocked the respectable Kimmo family a year ago. Then Sanna, his eccentric sister, died, and everyone considered it suicide. But now Maria, conducting her own investigation, comes to the conclusion that there was no suicide, someone dealt with Sanna, and Army knew something about Sanna that no one else knew. Who is the killer? And how to find it?..