.During he students ' rebellion against Nicholas the Second,Viana tries to kill the governor but it's her lover who is arrested and sent to a sinister fortress .

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.—dbdumonteil