<p> 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. </p> <p> 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. . . . </p>