Tsar Alexandre II meets a young student, Katia. He understands that he loves her and try to send her away but they end up seeing each other again and becomes his mistress. With the help of Katia, Alexandre prepares a liberal constitution, but these reforms make him hostile to the more privileged subjects without satirising the revolutionaries against the regime.
While still behind bars, a crook manages several schemes including one that almost gets his penniless young lawyer into trouble.The crook's mistress, married to a rich man, then becomes attracted to the lawyer.
Mario di Donati, a deserter from the Italian army, lives in Paris under a false name with Germaine, his French lover. When the latter learns about his hidden past, she feels hurt by Mario's lack of trust in her and she distances herself from him. In despair, Mario surrenders to the law but, at the time of trial, he runs away to join the woman he loves.
