New York: Pantheon, 1974, dj. Hardcover first edition - Classic mystery novel, in which the only witness to the murder is a chimpanzee - but a chimp who can sign. Review copy with publisher's slip laid in. ISBN: 0-394-491084.

New York: TOR / Tom Doherty Associates, (2006) dj. Hardcover first edition - A young deaf girl learns to communicate by sign language as she makes friends with a young chimp, but as her world widens, she finds that the survival of Sukari is in doubt. 267 pp. ISBN: 978-0765314420.

New York: TOR / Tom Doherty Associates, (2006). SIGNED - A young deaf girl learns to communicate by sign language as she makes friends with a young chimp, but as her world widens, she finds that the survival of Sukari is in doubt. SIGNED on the title page. Includes a Reader's Guide. 272 pp. ISBN: 978-0765353047.