The little-known third feature by the great French maverick Georges Franju (Eyes Without a Face, Judex) is a delightfully playful romp through Agatha Christie territory, whose script (written by Pierre Boileau and Thomas Narcejac of Les Diaboliques and Vertigo fame) is mischievously aware of the hoariest old murder-mystery clichés and gleefully exploits as many of them as possible.