France, 17th century. As a secret plot is on motion to overthrow King Louis XIII, the little daughter of Dogtanian, the brave muskehound of the Royal Guard, is kidnapped.
Monsieur De Treville decides to retire from his position as head of the Royal Guard, as he believes that a younger man should take over his difficult task. Widimer tries to apply for the post, claiming the glory for a series of successes, including the capture of Blancbec; but the appointment falls to Dogtanian. At first, he is reluctant to accept such a high honour, and tries in turn to persuade his three friends to accept the post.