Rival brother and sister Gaëtan and Chantal, the last heirs of the late billionaire financier Omar Porassis, use every trick in the book to try and claim his fabulous inheritance when two of Omar's natural sons, Roger and Marc, are found. The brother and sister try to manipulate Marc and Roger into stealing their inheritance. After discovering the deception, the two half-brothers join forces to escape the many traps set by Gaëtan and Chantal, who try to eliminate them by any means necessary.

Roger Pierre
Roger

Jean-Marc Thibault
Marc

Jacqueline Maillan
Chantal

Claude Véga
Thierry

Léonce Corne
Gaétan de Montescourt

Gisèle Sandré
Evelyne
Jean Faivre

Gib Grossac
Foreman who is looking for his bowl

Maxime Fabert
Roland

Jean-Pierre Moutier
Guard in armor

Jean Ozenne
Notary
Nono Zammit
Head of the guards
Don Ziegler
Omar Porassis
Brigitte Barbier
(uncredited)
Robert Deslandes
(uncredited)