The Edward T. LeBlanc Memorial Dime Novel Bibliography

Edition - The Bradys in a Madhouse; or, The Mystery of Dr. Darke - Secret Service edition, first appearance

(source: Stanford Libraries)
Online Full Text: Stanford Digital Repository
Series: Secret Service: Old and Young King Brady, Detectives no. 368
Item: The Bradys in a Madhouse; or, The Mystery of Dr. Darke
Author: New York Detective (pseudonym used by multiple people)
Date: February 9, 1906
Publisher: Frank Tousey (New York (N.Y.): 24 Union Square) -- United States