In Paris, private detective Dronogo meets a stunningly beautiful countess of Charleroy. He invites her to dinner, but the woman doesn’t show up. Soon the detective learns that the countess was murdered. The murder case is assigned to an experienced French investigator, Anne Deschamps, but a colleague from Interpol asks Dronogo for help.
The detective carefully studies the countess’s biography and comes to the conclusion that many people wanted her dead: her husband, her lover, her former sponsor, her servant—there are too many to list. But who is the killer? Dronogo is determined to find the answer at any cost…