Young Renata hears voices. Since her childhood, she has been visited by a fiery angel with sublime radiance. Mad about him, gone in search of him since he abandoned her, she meets on her way the knight Ruprecht who, out of love for her, will try to tear her away from this carnal possession. From tavern to convent, between scenes of spiritualism or exorcism, collective hysteria or burlesque humor, nothing is lacking at L'Ange de feu.