Great Apes, Paperback by Self, Will, ISBN 0802135765, ISBN-13 9780802135766, Brand New, Free shipping in the US

Simon wakes up to find that his girlfriend has turned into a chimpanzee, and although he, too, has become a chimpanzee, he is certain he is still human but is confined to a psychiatric ward where he is cared for by the odd Dr. Busner. Reprint.