Book 51

The reader journeys into a perilous fantasy world of dragons, sorcerers, and magic on a quest in search of the mythical unicorn in a multiple-plot, multiple-ending adventure.

Book 60

Vanished!

by Deborah Lerme Goodman and Frank Bolle

Published 1 August 1986

Book 74

Longhorn Territory

by Marc Newman and Frank Bolle

Published 1 October 1987