La Citadelle du silence (1937)

During the students ' rebellion against Nicholas the Second in Russia, Viana tries to kill the governor but it's her lover who is arrested and sent to a sinister fortress : hence the title. To help the prisoner,Vania marries the officer who commands the place. There the convicts have really a bad time, but Vania manages to communicate with her dear captive. But beware of informers.