Returning home one day, Hercule Poirot finds a furious woman demanding to know why Poirot has accused her of murdering a man she has never met. Poirot has certainly accused nobody of murder. Shaken, he goes inside, only to find a man who claims he received a nearly identical letter from Poirot that morning...

Poirot wonders how many more letters have been sent in his name. Who sent them, and why? Can Poirot find the missing link and dis-cover the truth without putting more lives in danger? Twisty, compulsive, and slyly brilliant, once again Sophie Hannah expertly revitalizes the most precise and charming detective of all time.