The Mystery

From Author Wars - https://authorwars.com/publications/the-mystery-711397.html

Overview:

Title: The Mystery
Author: Samuel Hopkins Adams, Stewart Edward White
Year: 1907
Publisher: Hodder & Stoughton
Price: 6/-
Pages: 320
Binding: Hardcover
Type: Novel
Title Reference: The Mystery
Notes:
- 1st UK ed.
- Publication date (inferred) and price from advertisements The Spectator 1907-04-06 p551 and Manchester Guardian -04-09 p5, without indication that it is forthcoming, and lack of earlier notices except Spring Announcements.
- HathiTrust Digital Library provides full view of one copy with the original cover (front and back, no spine): -- front cover Illustration and design match the US ed., with border grey rather than red--evidently (see back covers) as matching paper pasted on a cloth cover that is grey where the US cloth is red. Cover illustration is signed in faint block capitals, "Dan Sayre Groesbeck".
  
  -- title page, p[1], notes "With Eight Illustrations" There is no list of illustrations but comparison with the US ed. (Harvard U copy viewed at HathiTrust) shows that these 8 (frontispiece plus 7 plates not included in the pagination) are half of the 16 plates in the US ed., where they credited on the title page. -- novel spans p9-320 -- no back pages