Below is the complete list of Suzanne Collins’ Underland Chronicles books in order. For this series, the chronological reading order is the same as the order of publication.
Publication Order of Underland Chronicles Books
About Underland Chronicles
Suzanne Collins’ Underland Chronicles is a five-book middle grade fantasy series that begins with Gregor the Overlander and continues through Gregor and the Prophecy of Bane, Gregor and the Curse of the Warmbloods, Gregor and the Marks of Secret, and Gregor and the Code of Claw. Before Collins became internationally known for The Hunger Games, this series established many of the themes that would later define her work: war, loyalty, prophecy, survival, political conflict, and the moral weight placed on children during violent times.
The series follows Gregor, an eleven-year-old boy from New York City who falls through a grate in his apartment building laundry room with his little sister Boots. Instead of landing somewhere ordinary, they enter the Underland, a vast subterranean world populated by humans and giant creatures, including bats, rats, spiders, cockroaches, fireflies, and mice. The premise has the shape of a portal fantasy, but Collins quickly moves beyond simple wonder. The Underland is not just strange; it is unstable, divided, and already deep in conflict.
In Gregor the Overlander, Gregor learns that the Underlanders believe he may be part of a prophecy connected to their survival. Their kingdom of Regalia is elegant but vulnerable, surrounded by enemies and dependent on alliances that can shift quickly. Gregor’s first journey introduces Luxa, the young Underland princess; Ripred, a dangerous and intelligent rat; and the bond between Underland humans and their bats. Boots, Gregor’s toddler sister, gives the story warmth and innocence, but she also reminds readers that the danger here reaches children who are far too young to understand it.
Gregor and the Prophecy of Bane deepens the series by focusing on the feared white rat known as the Bane. Gregor’s role becomes more complicated because he is not simply being asked to survive; he is being asked to decide what kind of person he will become when others expect him to kill. This is where Collins’ interest in the ethics of violence becomes especially clear. Gregor is brave, but he is also a child being pushed into decisions that would trouble an adult.
The third book, Gregor and the Curse of the Warmbloods, shifts the danger toward plague and biological disaster. Humans and warm-blooded creatures are threatened by a deadly illness, forcing Gregor into another journey where mistrust between species makes survival harder. The book expands the political and ecological complexity of the Underland, showing how fragile every alliance is when fear begins to spread.
Gregor and the Marks of Secret brings the mice, or nibblers, into sharper focus and moves the series toward open war. Gregor begins to understand that some of the Underland’s greatest horrors are not accidents of prophecy, but the result of deliberate cruelty and political failure. The book is darker, more urgent, and more openly concerned with persecution, secrecy, and the warning signs people ignore until it is almost too late.
Gregor and the Code of Claw concludes the series with the full force of war. By this point, Gregor has changed profoundly. He is still loyal to his family, especially Boots and his missing father, but the Underland has forced him to confront fear, grief, anger, and responsibility. The final book is not a simple victory lap. Collins treats war as damaging even when characters fight for survival, and Gregor’s ending reflects the cost of everything he has endured.
The Underland Chronicles remains powerful because it combines adventure with emotional seriousness. It has giant bats and talking rats, but beneath the fantasy surface is a story about children caught in inherited conflicts, leaders trapped by prophecy, and the difficult choice to remain compassionate in a world that keeps demanding violence.