A nursery rhyme figures tantalizingly in each of these novels, but there is nothing childlike about the dark secrets and darker deeds of some of the characters, nothing innocent about the murderers. Whether the detective featured is the delightful, sharp-eyed Miss Marple, the redoubtable Hercule Poirot, or Chief Inspector Taverner of Scotland Yard each one is challenged by an adversary worthy of a master of crime. Here is Agatha Christie at her best - baffling, daringly logical, and immensely entertaining.