This film is an excellent adaptation of Agatha Christie's book. The actors were well chosen. Géraldine Alexander and John Moulder-Brown are a convincing newly wed couple. The couple gets to solve the lion's share of the mystery with guidance from Miss Marple of who warned them not to pursue the mystery. The location is beautiful and requires a vision of the sea. As with most Marple mysteries everyone and no one did it. In fact we are not sure that there was an "it" to did.
So get out your teacakes and sit back watching that new fangled invention that the Americans like (the TV) and be swept away to the Sleeping Murder.