next volume following, and serves as one of two equally important mystery plots in the story, and in The Hidden Window Mystery. Nancy struggles to decipher the diary and find the two missing men, aided by her best friends, and a new friend, the attentive Ned Nickerson. Artwork The original edition featured an image of an immaculately dressed Nancy retrieving the title object, and four illustrations by Russell H. Tandy; he updated his own frontispiece to a pen and ink drawing for the 1943 imprint. The cover art for this volume has not changed since 1950, when the revision art was introduced by Bill Gillies, showing a very animated Nancy running after a suspect with the diary falling from her hand, a building burning behind her. The 1962 revision added internal illustrations, featuring line drawings of an immaculately dressed Nancy and chums sleuthing, and a frontispiece of Nancy in jeans spying on ruins at night. All of these drawings are present in editions published through 2009. See also Nancy Drew External links Nancy Drew books 1932 American novels 1932 children's books 1962 American novels 1962 children's books Grosset & Dunlap books Children's mystery novels