Slaves of the Dragon — Grant Stockbridge

White slavery, the loathsome traffic in women's bodies -- and souls -- was stripping America of wives, sisters and sweethearts. Richard Wentworth, valiant champion of human rights, knew that an Oriental master criminal was captaining the slavery syndicate, guessed the unspeakable purpose behind those wholesale abductions. But with Nita hopelessly lost, with G-men harrying him relentlessly, can the Spider outwit his most formidable foeman and save America's doomed womanhood?