Compare the new letter with the other letters from ABC | Chapter three - Churston Agatha Christie: The ABC Murders Guide
Last update: 11 May 2016
Close to the door and pick up a letter D from ABC. In the zoom turn it and read it.
Look at yourself in the mirror before you start comparing the letters (3 ego points). You can also (two clues) look once again at the books on the cabinet: Hastings' photo album and ABC guide which is now open on the page with information about Churston. Of course you need to turn both books (zoom in) to hear Poirot's commentary.
Then look at the newspapers on the round table (two clues): Royal Mathematic and Statistic Society's and the newest edition of Daily Blague (a trophy Stone).
Letters comparison
Click the letters on the desk and compare them just like before - underline a word in the one letter and then in the second. Letters which need to be underlined are the same: 'I', 'A' and 'w'. The solution on the screenshot above (a trophy Gold paper knife).