Serialized originally in two consecutive issues of The Argosy (January and February, 1914).
"When importer Allen Tredger learned his long-assumed-dead brother may still be alive in Port Said, it triggered the beginning of a high-seas adventure, taking him on a quest though Africa, Turkey, and Mecca, encountering fanatics and secret societies along the way. And just what connection does John Solomon have with Tredger’s quest? And how does the Cockney’s silver ring tie into the mystery?"