On sale date from the publication date and volume number found in the Catalog of Copyright Entries, Part 2, Periodicals, New Series, Volume 34, 1939, Number 4. Second class periodical. Copyright number 428231.
Yarko the Great; Li Wan; Wang; Lailani and other vampiresses (villains, introduction)
Yarko and Li Wan go to Tibet in search of the Hoshai Plant (a flower with human blood). They are captured by Lailani and her group of vampiresses and Yarko has to pit his power of hypnotism against hers.