this would have be well without some completely pointless change bring in to the plot . at the start there be a completely implausible attempt to suggest that mark be suspect of be the killer . nothing in the show suggest the police would suspect him in this way and the plot line die quietly and have waste a fair amount of time . most of the performance be adequate at bad but the dialogue be often poor . one of the thing which make the book successful be the way it at least play with the idea of the supernatural . no one could be fool by the witch here . agatha christie be usually lucky than this in her adaptor for the screen .