Secret Service, Old and Young King Brady, Detectives

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Published by Frank Tousey and Harry E. Wolff, January 27, 1899-May 22, 1925.
Format: nickel weekly.

Publisher's description: "Who has not heard of ‘Old King Brady,’ the celebrated detective, who has unraveled more mysteries than any sleuth ever heard of? In the stories to be published in SECRET SERVICE, he will be assisted by a young man known as 'Young King Brady,' whose only aim in life is to exceed 'Old King Brady' in working up dangerous cases and running the criminals to earth. How well he does so will be fully explained in the following stories published in SECRET SERVICE."