I really enjoyed this mystery, Agatha Christie's 11th with Hercule Poirot and the first featuring a serial killer. Poirot's friend Captain Hastings is visiting England from his home in Argentina and laments that they don't have a good murder to solve. Before you know it, there's just such a murder, with a killer who writes taunting letters to Poirot. At first it's unclear that there's a serial killer on the loose, but after the second murder shows up, it seems clear that someone is targeting people based on the alphabet, with last names and towns that begin with A, B, and then C. They're challenged by their inability to identify anything that connects the three victims other than the sequence of letters. Finally, a chance clue pops up that ties the murders together, leading Poirot to identify a suspect, but he's still not satisfied. Did they catch the right guy or not?
