Prague 1942. The city is occupied by German troops. As the end of the war and the advancing Russian army comes ever nearer, the Czech chief inspector Beran and his assistant Jan Morava are hunting a serial killer. During his investigation, every step Morava takes is observed by Gestapo man Erwin Buback. Buback’s brief is to report to his Nazi superior Meckerle how closely the Prague police is linked to the Czech resistance movement. Then the Soviet troops reach Prague and in the armed rising against the occupiers even the most innocent become murderers.