Grimmer, who is investigating 511 Kinderheim, has passed out after being tortured by members of the former Czechoslovakian secret police. When he comes to, he is surrounded by their dead bodies. One of the bodies is that of Zeman, a Prague police inspector. And Detective Jan Suk, Zeman's protege begins to investigate this case.

The Czech police have turned their suspicions towards the journalist Grimmer and the young detective Suk for the murders of their former police chief and three former Czechoslovakian secret police members. Even though he is a suspect, Suk meets with Grimmer to find out the truth.