Prudence and Bélisaire Beresford have decided to take things easy. But when a rich Russian heiress disappears, Prudence can't resist and Bélisaire is forced onto the adventure. Their investigation will put them on the trail of a mysterious scientist who holds the secret to eternal youth...

Cast:Catherine Frot, André Dussollier, Nicolas Marié, Agathe de La Boulaye, Linh-Dan Pham, Éric Naggar,

Genre:Comedy, Crime, Mystery,

country:France,

Production:Les Films Français,