A collection of nineteen mysteries set in Europe and the United States with solutions to be provided by the reader based on clues in the text. Includes a section with solutions, explanations, and indications of degree difficulty for each story.

The Castle of the Red Gorillas 1986, Prentice Hall

ISBN-13: 9780131203877

Trade paperback

The Castle of the Red Gorillas 1983, Prentice Hall

ISBN-13: 9780131203600