The book tells of a 1947 expedition to Tibet in which the scientist visited the Bayan Har Mountains.

Robin-Evans claimed that the Dropa tribe was of extraterrestrial origin and had crashed on Earth.

The book featured photographs of the tribe and the alleged Dropa stones which contained messages from the extraterrestrials.

Although researchers were unable to locate Karyl Robin-Evans, the Dropa stones appeared regularly in the UFO subculture and author Hartwig Hausdorf popularized the story in his 1998 book The Chinese Roswell.

In 1995, British author David Gamon admitted in Fortean Times that he had written Sungods in Exile as a hoax under the Agamon pseudonym,[1] inspired by the popularity of Erich von Däniken and his books on ancient astronauts.