Double Dan is a 1924 crime novel by the British writer Edgar Wallace.Kiddle p.28 It was published in the United States as Diana of Kara Kara.
In 1927 it was adapted into a stage play of the same name by Wallace, which was poorly received by critics and closed after nine performances at London's Savoy Theatre.Wearing p.513
References
Bibliography Kiddle, Charles. A guide to the first editions of Edgar Wallace. Ivory Head Press, 1981.