In "The Colors of Space," Marion Zimmer Bradley tells the story of Bart Steele, a human being who is disguised as a member of an alien species in order to discover the secrets of their space travel. This book is a science fiction novel set in the future, a time when humans can already travel faster than the speed of light and can reach the remote corners of the universe with the help of another type of beings called the Lhari. In the book, the Lhari help the humans to travel faster than light and go to the far corners of different galaxies but are unwilling to give their secrets to them...

At one time Race Cargill had been the best Terran Intelligence agent on the complex and mysterious planet of Wolf. He had repeatedly imperiled his life amongst the half-human and non-human creatures of the sullen world. And he had repeatedly accomplished the fantastic missions until his name was emblazoned with glory. But that had all seemingly ended. For six long years he’d sat behind a boring desk inside the fenced-in Terran Headquarters, cut off there ever since he and a rival had scarred and ripped each other in blood-feud...