
Based on your book
by Collins, Suzanne
When Gregor falls through a grate in his laundry room, he expects to find lost socks, not a sprawling, war-torn civilization hidden beneath New York City. The Underland is a place where giant spiders, bats, and cockroaches are not just neighbors but political players in a brutal, centuries-old conflict. Gregor is no chosen one; he is a tired, responsible boy just trying to keep his family together. The series is remarkably unflinching, treating its young characters with a seriousness that makes the constant threat of injury or betrayal feel genuinely heavy. Collins builds a world that is claustrophobic and dark, refusing to sugarcoat the realities of combat or the weight of prophecy. This is a perfect pick for readers who want high-stakes fantasy that respects their intelligence and isn't afraid to get a little gritty.
If the weight of the prophecy and the claustrophobic tension of the Underland left you wanting more, our curated list leans into those same themes of reluctant heroism and hidden, perilous realms. We selected titles like The Hobbit and The Lightning Thief for their classic takes on the hero's journey, while books like Coraline and The City of Ember mirror the darker, more unsettling atmosphere found in Collins' writing. Whether you are craving epic, animal-centric battles or the quiet dread of exploring a dangerous, secret world, these stories share that same intense, immersive DNA.
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by Rick Riordan
Like Gregor, Percy Jackson is a reluctant hero thrust into a hidden, dangerous world that exists right beneath the surface of our own. Both series excel at blending high-stakes adventure with relatable family dynamics and a sense of destiny.
This classic shares the 'portal fantasy' element where young protagonists must navigate strange, perilous realms to rescue a family member. It captures a similar balance of wonder and genuine danger that fans of the Underland will appreciate.
This series features a young protagonist navigating a complex, often brutal world filled with political intrigue and warring factions. Its immersive world-building and serious, high-stakes tone mirror the gravity found in Collins' writing.
Fans who enjoyed the epic battles and animal-centric societies of the Underland will find a similar depth in Redwall. It features a rich, immersive world where unlikely heroes must rise to defend their home against overwhelming odds.

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Set in a subterranean city that is slowly failing, this book captures the claustrophobic, high-stakes survival atmosphere of the Underland. It focuses on young characters uncovering secrets to save their people from impending doom.
by Tony DiTerlizzi and Holly Black
This series perfectly captures the 'hidden world' trope, where children discover a secret realm of creatures living right alongside the human world. It balances the wonder of fantasy with the very real dangers of exploring an unknown domain.
by Brandon Mull
Like Gregor, the protagonists in Fablehaven stumble into a secret world filled with magical creatures that are not always friendly. The series masterfully balances lighthearted discovery with intense, life-or-death stakes.
by Paul Stewart and Chris Riddell
This book features a young protagonist who leaves his home and enters a bizarre, dangerous wilderness filled with unique creatures and societal structures. It shares the imaginative world-building and sense of peril found in the Underland.
The ultimate template for the reluctant hero, Bilbo's journey into a dangerous, underground world to face a dragon will resonate with fans of Gregor's own reluctant descent into the Underland. It is a foundational text for the 'hero's journey' archetype.
by Neil Gaiman
For readers who enjoyed the darker, slightly unsettling elements of the Underland, Coraline provides a perfect parallel. It explores the terror of a parallel world that seems inviting at first but quickly reveals its sinister intentions.

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As an Amazon Associate, we earn from qualifying purchases.
As an Amazon Associate, we earn from qualifying purchases.