Professor Waldhoff has to rush to finish his research project, and he asks his colleague Dr. Minz to come to his home to work overtime. But at home, things are awfully wrong.
Ewald Bienert phones home from his favorite pub, and realizes that things at home aren't right. But what has happened at Ewald's home? Even Derrick is confused.
In a burglary to a laboratory, a secret research report disappears and a guard gets killed. Derrick has a hunch that the crime is connected to a congress in West Berlin.