Who hasn't wanted to become “someone else”? The person you've always wanted to be…the person who won't give up half way to your dreams and desires?

One evening two men who have just met at a Paris tennis club make a bet; they give each other exactly three years to radically alter their lives. Thierry, a picture framer with a steady clientele, has always wanted to be a private investigator. Nicolas is a shy, teetotal executive trying not to fall off the corporate ladder. But becoming someone else is not without risk; at the very least the risk of finding yourself.