The Mystery of Three Quarters by Sophie Hannah

Returning home after lunch one day, Hercule Poirot finds an angry woman waiting outside his front door. She demands to know why Poirot has sent her a letter accusing her of the murder of Barnabas Pandy, a man she has neither heard of nor ever met. Poirot has also never heard of a Barnabas Pandy, and has accused nobody of murder. Shaken, he goes inside, only to find that he has a visitor waiting for him — a man who also claims also to have received a letter from Poirot that morning, accusing him of the murder of Barnabas Pandy. Poirot wonders how many more… Read more,