The Mystery

From Author Wars - https://authorwars.com/publications/the-mystery-309049.html

Overview:

Title: The Mystery
Author: Stewart Edward White, Samuel Hopkins Adams
Year: 1975
ISBN-10: 0405063172
Publisher: Arno Press
Price: $16.00
Pages: vii+286
Binding: Hardcover
Type: Novel
Title Reference: The Mystery
Notes:
Reprint of an undated Grosset & Dunlap edition. Uncredited illustrations are reported by libraries (LCCN and OCLC, below). Probably those are all or a selection from the 1907 black-and-white drawings by Will Crawford (see), which are reproduced as 16 plates in the 1st ed. and there credited on the title page. Pagination of this edition matches the 1st ed. as well as, presumably, the unknown Grosset & Dunlap ed. (not found at WorldCat).