The Secret of Abdu El Yezdi The Burton and Swinburne Adventures

Having successfully discovered the source of the Nile, Burton returns to London expecting to marry his fiancee and be awarded the consulship of Damascus. However, when he's unexpectedly knighted by King George V, his plans go awry. The monarch requires an agent to investigate a sequence of disappearances, and Burton, whether he likes it or not, is the man for the job.