In this exclusive authorized edition from the Queen of Mystery, a most unusual series of crimes at a student hostel intrigues Inspector Hercule Poirot, especially when a simple case of kleptomania paves the way to murder.Hercule Poirot doesn't need all his detective skills to realize something is troubling his secretary, Miss Lemon--she has made three mistakes in a simple letter. It seems an outbreak of kleptomania at the student hostel in which her sister works is distracting his usually efficient assistant.Deciding that desperate times call for desperate measures, the great detective agrees to investigate. Unknown to Poirot, however, desperation is a motive he shares with a killer. . . .