When telepath Lynne Fenlay is mysteriously brought from Earth to Mars, she finds herself caught in a battle for the planet's future. As Mars' atmosphere is restored, invisible alien creatures that feed on electricity are gaining strength and possessing the minds of human telepaths. To save Mars, Lynne must penetrate the nightmarish crystalline tower where her twin brother battles madness and discover the true nature of the aliens. But even if she triumphs, will she have a home to return to?