The A.B.C. Murders by Agatha Christie

There's a serial killer on the loose, bent on working his way though the alphabet. There seems little chance of the murderer being caught - until her makes the crucial and vain mistake of challenging Hercule Poirot to frustrate his plans . . .

This is a good one. It was one of my first Christies I don't remember when and got me into Poirot. I really like the set up and reveal. Really well done.

Poirot is on the trail of an apparent alphabetical serial killer who sends an advance warning letter. Can Poirot, and his mismatched band of amateur detectives, solve the case before the killer comes to the next letter?
Quite a different style of novel from the other Poirots I've read but it works well. And yet again the Queen of Crime had me fooled until the end.