Exiled from the court of Spain, Don Salluste, the chief of police, wants to take revenge on the Queen. One day he meets Ruy Blas, a young student who happens to be a lookalike of Don Cesar, his nephew. Salluste disguises Ruy Blas and presents him as Don Cesar. It doesn't take long before Ruy Blas, intelligent, virtuous and generous as he is becomes popular and the Queen, who has fallen in love with him, appoints him Prime Minister. All seems for the best in the best of worlds but Salluste has not forgotten his revenge, far from that ...