Released in France as Le Diable au Corps, The Devil in the Flesh stars Micheline Presle as nurse Marthe, who works in a French military hospital during World War I. She waits for her husband, Jacques, while he fights on the front lines. The lonely Marthe begins a tempestuous affair with 17-year-old François, with whom she had a dalliance before marrying Jacques. Jealous François struggles with the fact that Marthe is married, while she tries to prove her devotion to her young, hotheaded lover. The end result of François's callous behavior is tragedy for all concerned.