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...
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Catherine Frot
Prudence Beresford
André Dussollier
Bélisaire Beresford
Nicolas Marié
Doctor Nicolas Roscoff
Agathe de La Boulaye
Doctor Matarazzi
Linh-Dan Pham
Marie Van Dinh
Éric Naggar
Doctor Jünger
Bernard Verley
The General
Hervé Pierre
The family doctor
Sarah Biasini
Marie-Christine
François Bettens
Rudi
Julos Beaucarne
Prudence's father
Alexandre Lafaurie
Hector
Katia Tchenko
Miss Sakhaline
Marie-Christine Demarest
The Countess
Ophélia Kolb
Gisèle
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