• Upon questioning Agatha Christie says, “Of course, the poison bottle is mine, I am using it in my next novel, but I never opened it.”


  • A chromatogragy test was performed on the letter, and the ink came from a brown calligraphy pen.


  • A brown calligraphy pen was found on Agatha Christie’s writing desk.


  • After examining the pen, two sets of fingerprints were found on it.


  • One print belonged to Agatha Christie, after all, it was her pen, and the other belonged to Edgar Allan Poe.