The book outlines an astonishing theory positing that an ancient race of advanced extraterrestrials from outer space visited Earth millennia ago. According to Binder, these entities genetically intervened in terrestrial life, serving as the long-sought "missing link" in human development. 

Binder suggests that these ancient aliens never truly left us behind. Instead, they continue to monitor their ongoing evolutionary experiment. The modern sightings of unidentified flying objects (UFOs) and flying saucers are presented as proof that these creators are still actively watching, tracking, and observing humanity's progress from the skies. The book also early on tackled topics that remain highly popular in modern UFO lore, such as alien hybridization and the hidden motivations behind close encounters.