| title | ISBN-13 | year of publica- tion | other author(s) | |
|---|---|---|---|---|
| A Whisper of War | 978-1-57249-327-8 | 2011 | Lois Szymanski | |
| Ghost Hunter | 978-1-57249-298-1 | 2003 | " | |
| Ghost on Board: Gettysburg Ghost Gang #2 | 978-1-57249-267-7 | 2011 | " | |
| Nightmare | 978-1-57249-268-4 | 2002 | " | |
| Ohne Abschied | 978-3-570-30003-9 | 2002 | ||
| Ohne Abschied | 978-3-570-25006-8 | 2000 | ||
| The Ghost Comes Out | 978-1-57249-266-0 | 2018 | Lois Szymanski | |
| The Soldier in the Cellar | 978-1-57249-299-8 | 2005 | Lois Syzmanksi | |