The Edward T. LeBlanc Memorial Dime Novel Bibliography

Edition - The Bradys' Mysterious Shadow; or, The Secrets of the Old Stone Vault - Secret Service edition, first appearance

Online Full Text: Internet Archive
Series: Secret Service: Old and Young King Brady, Detectives no. 406
Item: The Bradys' Mysterious Shadow; or, The Secrets of the Old Stone Vault
Author: New York Detective (pseudonym used by multiple people)
Date: November 2, 1906
Publisher: Frank Tousey (New York (N.Y.): 24 Union Square) -- United States