Robert E. Howard 
The Moon of Skulls (Illustrated) [EPUB ebook] 

First published in Weird Tales, Part 1, June 1930; Part 2, July 1930. Kane goes to Africa on the trail of an English girl named Marylin Taferal, kidnapped from her home and sold to Barbary pirates by her cousin. When he finds the hidden city of Negari, he encounters Nakari, ‘the vampire queen of Negari’.