Cover image not available
Originally published, Greenwich (Conn.): Fawcett, 1968; London: Hale, 1969.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Pale grey for guilt by John D. MacDonald. ISBN 0330026690. Published by Pan Books in 1971. Publication and catalogue information, links to buy online and reader comments.