THE PAWNS OF NULL-A

Sphere paperback, 1974 reprint. Cover painting by
Bruce Pennington.

"What was the follower? 

Gosseyn knew the creature threatened to destroy whole solar systems but not even his Null-A trained double brain could thwart the Follower's plans. Then he found himself face to face with a force that lay at the very roots of human intelligence.... 

And fighting an insane mind that had once controlled his body."