The young lawyer Felix Spät (Thomas Heinze) is one of many witnesses when the respected senior civil servant Kohler (Maximilian Shell) shoots Professor Winter dead without an apparent motive. The crime is committed in the middle of the busy ¨Du Théatre¨ restaurant in Zurich where the influential Kohler insists on being arrested and is unruffled at the court sentence of 20 years in prison. But then he asks Felix Spät to reopen the case from a purely theoretical perspective. Initially, he thinks this is a bad joke, although Kohler’s daughter Helene (Anna Thalbach) had protested her father’s innocence to Spät in the courtroom. But Spät knows that Kohler is guilty. Nevertheless, he consents, not least because of Helene – and he could also do with the money…

What began as a mental exercise gets to the point where Felix Spät is out of his depth. Suddenly, Kohler is a free man and an allegedly innocent man has had to die. But what is guilt and what is right in this complicated case? There seems to be only one solution for Felix Spät: he will have to return to “Du Théatre” one more time.