Gustav Gloom and the Nightmare Vault (#2)

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Hugo Award nominee Adam-Troy Castro’s exciting new world full of shadows and mystery grows in book 2 of the Gustav Gloom series. In Gustav Gloom and the Nightmare Vault, Fernie and Gustav find themselves battling another shadowy foe—The Shadow Eater. He is after one thing, The Nightmare Vault, which his master, the evil Lord Obsidian will use to unleash the most terrifying and threatening shadows into the world. As Fernie and Gustav race to stop the Shadow Eater, Fernie learns about Gustav’s mysterious past and just what happened to his missing parents. 

Featuring a unique paper-over-board cover and beautifully dark full page illustrations by Kristen Margiotta, Gustav Gloom is sure to be a hit with fans who, like Fernie, love a little darkness in their lives.


“Castro sheds light on the past and nature of the aptly named Gloom mansion […] spooky!”


“Adam-Troy Castro [...] holds an exquisite imagination and brings a nightmarish world to life in the Gustav Gloom series.”

Kids Reads

“There’s pretty much nothing not to love about a mansion filled with endlessly spooky rooms, shadows with minds (and appetites) of their own, and sweet characters with dark secrets.”


“This is an amazing book. And if you still haven’t read the first one, you need to do so right away. Because Gustav Gloom is such an amazing person, and you will all fall in love with him.”

Carina’s Book Review

“The paranormal aspects are well-done but not over-done, and there’s enough of an overarching plot to assure readers that this isn’t a series full of one-shot adventures. And so I hereby proclaim middle-grade paranormal to be the next big trend.”

Pass the Chiclets

"Fun fast read. I love Fernie and Gustav and the dynamic they have together"

SF Book Review

Awards & Accolades