 Through various intrigues and investigations, a California estate lawyer learns that the pre-Toltec stone building upon which his retainer's ancestor, a "conquistador", built a mansion four centuries earlier, confers immortality to those who know its secret.A cult of immortals operates secretly from the house and even has spaceships capable of travel to Mars where it has a base.The lawyer falls for a beautiful cult member who tells him an atomic war is imminent and that most of the cultists want to remove the building's stones to Mars to keep their power safe from radioactive fallout.