The authorities expect the case of Friedel Walter, alias "Dr. Mueller," to be a straightforward one: he was working as a doctor without proper credentials under a false name. But Mehlin, the man in charge of his case, knows that there is more to the story. When he was injured fleeing from a concentration camp, resistance worker Irene asked her medical student boyfriend Walter to give him medical care.

Karla Runkehlas Irene 'Reni' Schorn, verehel. Kerster
Wolfgang Kielingas Friedel Walter
Wilhelm Koch-Hoogeas Max Kerster
Wolfgang Langhoffas Ernst Mehlin
Erika Dunkelmannas Oberschwester
Harry Hindemithas Staatsanwalt
Angela Brunneras Schwester Hilde
Erich Franzas Der Bezechte