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...
Associés contre le crime: L'oeuf d'Ambroise
The Beresfords are tasked with finding what happened to a Russian heiress who's mysteriously disappeared.
