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...
Catherine Frot
André Dussollier
Nicolas Marié
Agathe de La Boulaye
Linh-Dan Pham
Éric Naggar
Bernard Verley
Hervé Pierre
Sarah Biasini
François Bettens
Julos Beaucarne
Alexandre Lafaurie
Katia Tchenko
Marie-Christine Demarest
Ophélia Kolb
Léa Wiazemsky
Luc Palun
Isabelle Migotto