Frank Heller was the pen name of the Swedish writer Gunnar Serner (1886-1947) who wrote light novels about shady international business transactions. His best known works include Philip Collin, who was simultaneously a detective and a thief. The Marriage of Yussuf Khan is a "corking adventure and detective story [about] an international criminal who has all the acuteness and courage of a Sherlock Holmes, as well as his marvelous capacity for impersonation and mimicry.