A mysterious homicide case leads to Constable Karl Guber to seek out psychoanalyst Sigmund Freud for the first time. The daughter of the director of the Wiener Burgtheater has been murdered under gruesome circumstances: the corpse has been drained of all its blood. Detective Gruber suspects that a vampire is on the loose in Vienna.
Sigmund Freud is suspected of having raped one of his patients. The young woman is in a vegetative state and unable to communicate. The Public Prosecutor investigates Freud, and there is no shortage of witnesses willing to testify against the Professor. Anna starts to suspect that her father is the victim of a conspiracy.
Shots echo through Vienna's streets at dawn. A sniper has holed up in a church tower and threatens to shoot anyone who dares to show themselves on the square below. Constable Karl Gruber can persuade Freud to help him find a diplomatic solution to the situation. Under time pressure and against strong resistance from Karl's police colleagues, Freud negotiates with the man who - just like Karl - fought in the front lines in World War I.
A new patient appears on Sigmund Freud's roster. The initial session soon takes a dramatic turn when the man pulls a gun on Freud. The day before, he murdered his own father, and now he demands absolution from the Professor. While Anna contacts Karl and they both hold an emergency session right outside the therapy room in an effort to put an end to the hostage situation, Sigmund tries to use all means at his disposal to persuade the man to surrender before a disaster occurs.