The action takes place in occupied Czechoslovak Republic after assassination of Schutzstaffel (SS)-Obergruppenführer and General der Polizei Reinhard Heydrich, acting Reichsprotektor of the Protectorate of Bohemia and Moravia In Prague on 27 May 1942.



Jirka is the boy whose family was murdered in the village of Lidice as repercussions for the assassination of Heydrich. He stays with his uncle - engineer Petr Lom. Marta - a young girl leaving next door, working at the post office helps to take care of the boy. Lom has just started working on the military airport, governed by Sudeten-Nazi named Ullman. Resistance is quite active in the airport, collecting arms and grenades and communicating with allies, sometimes doing some small diversion. They have a lot of great intel thanks to secretary Jana Tomesowa, who is trustee of Ullman and has access to a lot of restricted informations. Jirka also starts to help at the airport, but he's filled with sorrow and need of revenge. He's caught ...