Frank Roscoe's Secret (Esprios Classics)

"Allen Chapman" began as a pseudonym for stories written by Edward Stratemeyer and evolved into a pen name for several Stratemeyer Syndicate series. It was used for: The Ralph of the Railroad series (1906-1928), The Boys of Business series (1906-1911), The Darewell Chums series (1908-1911), The Fred Fenton series (1913-1915), The Tom Fairfield series (1913-1915) and The Radio Boys series (1922-1930).