This is one of the most interesting Poirot mysteries. It is 1935 and Hastings has returned from Argentina to visit - will he and Poirot get to hunt a murderer again? Poirot is concerned by an anonymous letter he has received, stating, "look out for Andover, on the 21st of the month." It is signed simply, "ABC". When an elderly woman, named Ascher, is found murdered in her little newsagent shop, Poirot and Hastings become involved in a case which is different to any they have faced before. It seems a homicidal maniac is striking victims at random, based only on the first letters of their name and the place that they live. An ABC railway guide is always placed on or near the vitim. As the bodies mount, the families and friends of the victims propose working with Poirot, to help solve the case.
This novel shows why Agatha Christie is still the best crime writer of all time. The book may be set in the 1930's, but she has such an understanding of human nature and her plot and characters all stand the test of time. Her books never drag, are always immensely readable and Poirot - well, he is simply the best fictional detective ever created. Enjoy!