The cliffs blazed with flame...an oval object rose into the sky...and the people of Rancho Valverde know they had just seen a flying saucer!
Charles Barron, the hot-tempered owner of the ranch, immediately armed his men for a search.
Mrs. Barron, a firm believer in UFOs, got ready to welcome the aliens.
Only the Three Investigators stopped to question the bizzare events. Was Rancho Valverde really being invaded from outer space? Or could the wealthy Barrons be victims of a brilliant hoax?