5 books in series

Gustav Gloom

Gustav Gloom is a 5-book series with 5 released primary works first released in 2012 with contributions by Adam-Troy Castro.

Gustav Gloom and the People Taker
Gustav Gloom and the Nightmare Vault #2
Gustav Gloom and the Cryptic Carousel #4
Gustav Gloom and the Inn of Shadows
Gustav Gloom and the Castle of Fear