
Based on your book
by Suzanne Collins
When eleven-year-old Gregor falls through a laundry room grate in New York City, he lands in the Underland, a subterranean civilization teetering on the edge of collapse. He is not a chosen one looking for adventure; he is just a boy trying to find his lost father and return home. The story moves at a breakneck pace, shifting from the claustrophobia of dark tunnels to the high-stakes tension of war between giant insects and humans. Unlike many hero journeys, this book does not shy away from the darker realities of conflict, death, and the burden of prophecy. It is a gritty, emotional read that treats its young protagonist with respect, making it perfect for readers who prefer their fantasy with a side of survival and real-world consequences.
If the unsettling atmosphere and the weight of destiny in the Underland left you wanting more, these ten stories capture that same intersection of hidden worlds and reluctant leadership. We chose these titles because they excel at building immersive, often dangerous environments where young characters must step up to solve problems adults cannot fix. Whether it is the subterranean survival of City of Ember or the mythological stakes in The Lightning Thief, these books share the same DNA: ordinary kids thrust into extraordinary, high-pressure circumstances where loyalty and courage are the only things keeping them alive.
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by Rick Riordan
Like Gregor, Percy Jackson is an ordinary boy thrust into a hidden, dangerous world where he must navigate complex prophecies and mythological creatures. Both series feature a relatable protagonist who discovers hidden strengths while dealing with the weight of destiny.
This book offers a rich, immersive secondary world similar to the Underland, filled with unique creatures and high-stakes political intrigue. Readers who enjoyed the bond between Gregor and his giant bat will appreciate the deep connection between Lyra and her daemon.
Fans of the animal-human interaction and epic battles in the Underland Chronicles will find a kindred spirit in the world of Redwall. It features a similar blend of heartwarming community and intense, gritty warfare that challenges its young protagonists.
by Eoin Colfer
This series explores a technologically advanced civilization living directly beneath the human world, mirroring the 'hidden world' aspect of Gregor the Overlander. It balances high-stakes action with a witty narrative voice that keeps the pacing tight and engaging.

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Both books center on a young protagonist who must travel to a strange, dangerous realm to save a missing family member. The narrative explores themes of courage, family bonds, and the struggle against darkness, much like Gregor's journey.
by Tony DiTerlizzi and Holly Black
This series captures the sense of discovery as children stumble upon a secret, magical world hidden in plain sight. It shares the 'fish out of water' feeling that Gregor experiences when he first falls into the Underland.
Set in a subterranean city facing an existential crisis, this book perfectly mirrors the claustrophobic and high-stakes atmosphere of the Underland. It focuses on young characters taking responsibility for their community's survival against overwhelming odds.
This story beautifully explores the blurring lines between reality and fantasy, drawing characters into a world they never expected to enter. Much like Gregor, the protagonists must rely on their wits and bravery to navigate a dangerous, magical environment.
by Paul Stewart and Chris Riddell
This book excels at building a strange, perilous, and highly imaginative world that feels just as alien as the Underland. It features a reluctant protagonist who must survive a series of encounters with bizarre creatures, echoing Gregor's own trials.
by C.S. Lewis
As a classic portal fantasy, it sets the standard for children entering a world in crisis and becoming unlikely leaders. The themes of war, prophecy, and sibling loyalty will resonate deeply with anyone who loved the dynamics of the Underland Chronicles.

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