- HörbuchGustav Gloom and the People TakerAdam-Troy Castro
- HörbuchGustav Gloom and the Nightmare VaultAdam-Troy Castro
- HörbuchGustav Gloom and the Four TerrorsAdam-Troy Castro
- HörbuchGustav Gloom and the Inn of ShadowsAdam-Troy Castro
- HörbuchGustav Gloom and the Cryptic CarouselAdam-Troy Castro
- HörbuchGustav Gloom and the Castle of FearAdam-Troy Castro
- HörbuchSerien: Gustav GloomAdam-Troy Castro