The Beresfords investigate mysterious deaths at an old people's home.
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...
Inviting the ex-wife to a family reunion when the none-too-secure new wife will be there hardly seems to be a recipe for success, and true to form, bodies have begun to stack up by the end of this cinematic update of a classic Agatha Christie tale. Luckily for the extended clan gathered at a sumptuous waterfront estate in Northern France, Inspector Martin Bataille is on hand to find out not only "who done it" but why.
