Simon Coleman is a Parisian cop, specialist in undercover missions. If he sometimes plays his life on a pile or face, Simon never gets away from his smile, and whatever pressure he faces. That makes him cool for some... and completely unconscious for others. To complete this immersion career, Simon has preferred a life without attachments; no lasting relationships, let alone children. Until that morning, when he turned on his cell phone after a six-week mission under another identity, the messages chained up... when he learned that his sister died in an accident with her husband.