The Devil's in Love: The French Foreign Legion is the setting for this episodic adventure yarn. When military doctor Andre Morand is wrongfully convicted of a murder, he escapes the firing squad with the help of his friend, Jean. Taking refuge in a mission run by the uncle of the beautiful Margot, Andre agrees to care for the sick there. After professing his love for Margot, he learns that she is engaged to Jean, who is now sick. Vowing to return to aid Jean and others, Andre prepares to face death, but a series of events may turn things in his favor.