While searching for lost Inca treasure in South America, American mining engineer Nicholas Graydon encounters Suarra, handmaiden to the Snake Mother of Yu-Atlanchi. She leads Graydon to an abyss where Nimir, the Lord of Evil is imprisoned in a face of gold. While Graydon's companions are transformed by the face into globules of gold on account of their greed, he is saved by Suarra and the Snake Mother whom he joins in their struggle against Nimir.

Abraham Grace Merritt (1884-1943) was an American Sunday magazine editor and a writer of fantastic fiction. The Science Fiction and Fantasy Hall of Fame inducted him in 1999, its fourth class. Merritt's novels and stories typically revolve around conventional pulp magazine themes: lost civilizations, hideous monsters, etc. His heroes are usually gallant Scandinavians, his villains treacherous Germans or Russians and his heroines often virginal, mysterious and scantily clad.