Time is the Simplest Thing

This book is also known as The Fisherman. Finally came the time when Earth's astronauts were forced to abandon all attempts to probe the stars. It was then that telepathic exploration was developed, and eventually men could project their minds into the farthest reaches of space. With numerous missions behind him, Shepherd Blaine ranked high amongst the Telepaths. Until, in one terrifying moment, he found his mind invaded by an alien creature.