Chester K. Steele was a pseudonym used by the Stratemeyer Syndicate. The Stratemeyer Syndicate was the producer of a number of series for children and adults at the beginning of the twentieth-century, including: 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 which pioneered the technique of producing long-running, consistent series of books using a team of freelance authors to write standardised novels. Those novels were published under a pen name owned by his company. The first title, The Mansion of Mystery, was written by Edward Stratemeyer and the rest were ghostwritten.