Bélisaire Beresford (André Dussolier) has profited from the success of his book about his heroic career, but his wife Prudence (Catherine Frot), who has always helped him in his investigations, is tired of only being the wife of the famous writer. She wants adventure, intrigue and risk. So she takes over the management of a private detective agency in Switzerland. Her first case is the mysterious disappearance of a Russian billionaire. Accompanied by Bélisaire, whose anonymity is now hard to keep, Prudence goes after a genius who invented a youth potion that was given to the missing woman while she was in a beauty clinic...

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