Someone has played a cruel trick on Dr Wallace Langley. Having been lured away from his London surgery and knocked out he returns to find that someone has not only impersonated him during his absence but also usurped his own medical position to commit murder. Curtis Burke is soon on the trail, together with his colleague Inspector Ames. The pair discover that the theft of a rare jade artefact of Inca origin lies at the heart of the crime - one of a series of robberies conducted by the criminal mastermind known as the 'Long Arm'. But when Burke's friend, the lawyer Sir Garvice Watkin, informs the young policeman of his extraordinary suspicions regarding Inspector Ames, Burke finds himself facing not only a baffling investigation, but also a terrible personal dilemma...
Originally published in 1937, this is a vintage murder mystery from the golden age of British crime fiction.