An art dealer wants to buy a Modigliani, which is tattooed on the back of an old soldier.

Jean Gabin
as Comte Enguerand de Montignac,alias « Legrain »

Louis de Funès
as Félicien Mézeray

Dominique Davray
as Suzanne Mézeray

Paul Mercey
as Maurice Pellot, entrepreneur

Yves Barsacq
as le postier de Montignac

Henri Virlogeux
as M. Dubois, le peintre

Hubert Deschamps
as e Pr Mortemont, dermatologue

Jean-Pierre Darras
as Lucien, facteur de Montignac

Patrick Préjean
as Detective #1

Joe Warfield
as Larsen, l’un des acheteurs américains du tatouage (celui qui parle bien français)