Stated first printing, issued 3 months before the UK version "The Mind Trap". Tight, flat, square book with edge wear. Spine creased and cupped. Owner's marks on the inside front wrapper. Pages toned. Third in a four book series exploring extra-sensory perception. 

Alien powers of terrible force begin to invade the psychic domain of the psi-group. Someone had found a way to cross great distances to enter and destroy human minds. The immeasurable threat of these powers in the hands of an unknown but ruthless enemy had to be eliminated, and so deadly combat was begun for the highest of all stakes—control of the planet. But the hazardous search for the source of this lethal power led unmistakably to a sweet-natured innocent yogi and an intelligent, confused young girl.