S D ยท S. Donovan
| title | ISBN-13 | year of publication |
|---|---|---|
| A Surprise for Gappy | 978-0-9821404-0-6 | 2008 |
| Gappy and the Thieves | 978-0-9821404-5-1 | 2010 |
| Gappy Disappears | 978-0-9821404-3-7 | 2009 |
| Gappy is Kidnapped | 978-0-9821404-4-4 | 2009 |
| Gappy's Great Escape | 978-0-9821404-8-2 | 2010 |