Paperback
(Random House Books for Young Readers, April 12, 1988)
Nine-year-old Boon has grown too old to see her imaginary friend O'Diddy, so in his lonesome desperation he concocts a scheme to force her into remembering him
Hardcover
(Random House Books for Young Readers, May 12, 1988)
Nine-year-old Boon has grown too old to see her imaginary friend O'Diddy, so in his lonesome desperation he concocts a scheme to force her into remembering him