Skip to content

Books
Articles

wonderlit

The right book for right now.

Books
Articles
About
Terms
Privacy

© 2026 wonderlit · Support indie bookstores

As an affiliate, Wonderlit earns from qualifying purchases through Bookshop.org and Amazon.

Can’t find a book? Let us know – we’re always adding new titles.

Send Feedback

Books by Adam-Troy Castro | Wonderlit

Books by Adam-Troy Castro

3 books · Ages 8–12

Known for the Gustav Gloom series, Adam-Troy Castro writes middle grade for ages 8–12, exploring themes of fear & bravery, friendship & loyalty, good vs. evil.

Series

Gustav Gloom and the Nightmare Vault

Gustav Gloom and the Four Terrors

Gustav Gloom and the Castle of Fear

3 books · Ages 8–12

By Age Range

Gustav Gloom and the Four Terrors

Gustav Gloom and the Castle of Fear

Gustav Gloom and the Nightmare Vault

Gustav Gloom and the Four Terrors

Gustav Gloom and the Castle of Fear

Common Themes

Fear & Bravery Friendship & Loyalty Good vs. Evil Ghosts Monsters Fantasy & Magic Adventure Being Different

Gustav Gloom and the Nightmare Vault

If Your Family Loves Adam-Troy Castro, Also Try

The Fallen

Potions & Parameters

Potions & Parameters

The Adventures of Aku

The Adventures of Aku

King of Lost Dreams

King of Lost Dreams

Hell's Heroes