Barcelona, early twentieth century. While a trio of masked burglars and their minions search for an ancient Moorish treasure that can only be located when the two parts of an ornamental chain are connected, Inspector Hernández and his faithful assistant Carlos follow the dreadful crime path they walk by. (Only the German cut of the three original Spanish episodes has survived.)

Leopoldo Quintana is a lawyer who, determined to reach power and capable of anything to get what he wants, uses blackmail and shady maneuvers to be appointed congressman for the Balearic Islands, then minister, and finally President of the Council of Ministers of the Spanish Government.

Felipe I el Hermoso provokes with his behavior the madness of his wife, Juana de Castilla.