| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| New Clues to Harry Potter Book 5: Hints from the Ultimate Unofficial Guide to the Mysteries of Harry Potter | 978-0-9723936-2-1 | 2003 | Astre Mithrandir · E.L. Fossa |
| The Plot Thickens... Harry Potter Investigated by Fans for Fans | 978-0-9723936-3-8 | 2015 | Melissa Rogers · Michelle Heran |
| Ultimate Unofficial Guide to the Mysteries of Harry Potter | 978-0-9723936-1-4 | 2015 | |
| Ultimate Unofficial Guide to the Mysteries of Harry Potter | 978-0-9723936-4-5 | 2005 | Astre Mithrandir · E. L. Fossa |
| Ultimate Unofficial Guide to the Mysteries of Harry Potter | 978-0-9723936-0-7 | 2002 | |
| Ultimate Unofficial Guide to the Mysteries of Harry Potter: Analysis of Book 6 | 978-0-9723936-6-9 | 2007 | E. L. Fossa · Astre Mithrandir |