THE X FACTOR (Ace #92551).
Andre Norton, Ace Books, Inc., New York, 1970.
 
Science Fiction
(1st book in the Game of Stars & Comets series)
 
Because he does not fit into his father's world, a mutant steals a spaceship which crashes on an unknown planet where he discovers a new species of kindred animals with which he can communicate.
 
Secure binding with clean pages, mild cover wear, a light bottom spine shift and creases to the rear cover. Softcover book with 158 pages.