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...

Director: Pascal Thomas

Writer: Clémence de Biéville, Nathalie Lafaurie, Pascal Thomas

Actors: André Dussollier, Catherine Frot, Linh-Dan Pham

Production: N/A