Biggers, Earl Derr,
--The House Without a Key, Avenel, New York, 1925.
--The Chinese Parrot, Avenel, New York, 1926.
--Behind the Curtain, Avenel, New York, 1928.
--The Black Camel, Avenel, New York, 1929.
--Keeper of the Keys, Avenel, New York, 1932. ISBN: 0-517-347075