Chester K. Steele was a pseudonym used by the Stratemeyer Syndicate. Titles published under this pseudonym include: The Mansion of Mystery (1911), The Diamond Cross Mystery (1918) and The Golf Course Mystery (1919). These were aimed at an older audience than most of the other syndicate books. The first title, The Mansion of Mystery, was written by Edward Stratemeyer and the rest were ghostwritten. The Stratemeyer Syndicate was the producer of a number of series for children and adults including: The Nancy Drew mysteries, The Hardy Boys, The various Tom Swift series, The Bobbsey Twins and others.