King Louis XIII of France is thrilled to have born to him a son - an heir to the throne. But when the queen delivers a twin, Cardinal Richelieu sees the second son as a potential for revolution, and has him sent off to Spain to be raised in secret to ensure a peaceful future for France. Alas, keeping the secret means sending Constance, lover of D'Artagnan, off to a convent. D'Artagnan hears of this and rallies the Musketeers in a bid to rescue her. Unfortunately, Richelieu out-smarts the Musketeers and banishes them forever.

Sur le point de s'engager avec un peintre, Amy Jolly, une chanteuse de cabaret, tombe amoureuse d'un légionnaire, Tom Brown, alors qu'elle se produit dans un établissement marocain. Celui-ci refuse d'abord ses avances...