Mark of Cain (1989)

In 1866, as Austria faces war with Prussia, 19-year-old Ludvík Machl joins a secret Czech resistance group. When he is caught with stolen funds and a weapon, the police commissioner spares him from prison on the condition that he work as an informant. Trapped by fear and betrayal, Ludvík is forced down a path that leads inexorably toward his own destruction.