The Blue Veil

John Drake visits the Arabian coast to investigate illegal slave trading. Disguised as a slave trader himself, his questions meet with strong resistance from both locals and an Englishman who seems intent on keeping him away. He believes that proof of the human trading will come from a Moukta who supposedly employs slaves in his diamond mine. Gaining the aid of a foreign woman in exchange for an offer of help, he sets out to locate the mine and gather the necessary evidence.