Conan: The People of the Black Circle by Robert E. Howard

It is set in the pseudo-historical Hyborian Age and concerns Conan kidnapping a regal princess of Vendhya (pre-historical India) and foiling a nefarious plot of world domination by the Black Seers of Yimsha. Due to its epic scope and atypical Hindustan flavor, the story is considered an undisputed classic of Conan lore and is often cited by Howard scholars as one of his best tales. It is also one of the few Howard stories where the reader is treated a deeper insight on magic and magicians beyond the stereotypical Hyborian depiction as demon conjurer-illusionist-priests.