| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| September 2002 |
|
This Gray Spirit | Pocket Books | Novel | |
| October 2002 |
|
This Gray Spirit | Pocket Books | Novel | |
| March 2011 |
|
Dieser graue Geist | Cross Cult | Novel | |
| November 2011 |
|
Dieser graue Geist | Cross Cult | Novel | |
| September 2012 |
|
This Gray Spirit | Simon & Schuster UK | Novel | |
| November 2018 |
|
Dieser graue Geist | Cross Cult | Novel |