Over a drink in Paris, two men give each other three years to see which one can more radically alter his life. Blin becomes a private detective. He takes on a new identity, even a surgically altered face. Gredzinski, a self-effacing corporate executive, discovers liquor that evening and rapidly yields to the sensuality and self-confidence induced by alcoholism. Things get complicated when Blin is hired by an ex-lover to find himself and when Gredzinski secretly follows his girlfriend to her home. A helter-skelter tale of humor and suspense.