Inhalt: When two little children are murdered and the suspect - the children's mother as well as one of Freud's patients - is arrested, the Professor is compelled into action: he is sure the suspect is innocent. Instead he suspects the children's father committed the murder. He is able to persuade Karl Gruber of his suspicions. Together, they explore the family background behind the case... but will they be able to prevent an impending disaster in time?