Carlos Delargo the banished son of a royal princess of Mandorra is returned to the kingdom to be tried for a murder change. However he is freed by King Lorenzo whom bears a remarkable resemblance to Delargo. When the king is wounded by assassins sent by Napoleon Delargo takes over the throne at the request of the Prime Minister in a plot to thwart the traitors. He also falls in love with Princess Teresa the king's fiancée.