After the failure of his recent criminal exploits, international con artist Alexandre Dupré sets off for Venice to try to dupe some Japanese business men into buying a fake copy of a stolen Caneletto. On the aeroplane, a stranger asks him to look after his briefcase until after they have landed. Alexandre agrees, but the stranger is shot dead soon after and Alexandre himself becomes the target of enemy agents who are keen to recover the briefcase...
Jean-Paul Belmondo
as Alexandre Dupré / Vicomte de Valombreuse
Mirella D'Angelo
as Sophie Chaperon / Pamela
Michel Galabru
as Achille Sureau, un ancien complice d'Alexandre
Carla Romanelli
as Gina, ancienne amante et complice d'Alexandre
Paolo Bonacelli
as Kamal
Georges Géret
as Joseph, dit « commandant Donnadieu », un agent de la DGSE
Von Gretchen Shepard
as Caroline
Pierre Vernier
as Helmut von Ofenburg, pigeon de service
Michel Beaune
as Louis Fréchet
Tony Kendall
as Fredo
Maurice Auzel
as Le franchouillard
Henri Guybet
as Machavoine, l'espion plombier
