London, Hodder and Stoughton, 1927. Presumed first edition. Eccentric retired soap manufacturer Hollis has a room filled with precious stones and bullion. When it is burgled with nary a sign of a break-in, Dr. Thorndyke is called in to investigate. Not the usual mystery story, as the first half concerns a suspect's time in Africa. Unusual in structure. Some foxing, front endpaper browned, corners bumped. Spine slightly sunned. $35.00.