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The little Belgian detective exercises his "little grey cells" against a mysterious correspondent who writes to him predicting the murders of several people. Poirot is forewarned when the first two murder victims' names begin with an A and a B, now he must solve the case before the killer strikes again in an attempt to complete the alphabet. I must say that I enjoyed this book very much. I had first read this years ago but had forgotten who the murderer was and why he actually committed the murders. I give it an A!