On May 27, 1942, the assassination attempt is carried out; it is nearly botched when Jozef's Sten submachine gun jams, but Heydrich is severely wounded by Jan's grenade that shatters his limousine. Immediately after, the assassins go on the run. In response, SS security forces round up thousands of Czech citizens and carry out a terrible reprisal. Lenka is killed trying to escape Nazi soldiers on the street. Resistance fighter Karel Čurda (Jiří Šimek) turns on the agents and reveals the family which hid them. Meanwhile, the agents have now relocated and hide in the Saints Cyril and Methodius Cathedral in Prague. Heydrich soon dies from his injuries in the hospital. Reprisals continue with the village of Lidice destroyed with all the males over age 16 shot, children and women sent to concentration camps.