The 100 Books in Order
Part ofKass Morgan Books in OrderThis page lists The 100 books in order by Kass Morgan, with short summaries, series background, and a clear guide to where new readers should start.
Last updated: July 15, 2026
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The 100 books in publication order
4 books
The 100
by Kass Morgan
2013
Centuries after nuclear war drove humanity into space, one hundred teenage prisoners are sent to test whether Earth is habitable. Clarke, Wells, Bellamy, and Glass confront a dangerous planet, painful secrets, and a mission that may be humanity's last chance.
Day 21
by Kass Morgan
2014
Twenty-one days after the Hundred reach Earth, a mysterious enemy and a spreading illness raise new questions about who survived. Clarke searches for other colonists, Bellamy pursues his sister, and Glass faces an impossible decision aboard the Colony.
Homecoming
by Kass Morgan
2015
New dropships arrive from the dying Colony, bringing hope, wounded survivors, and old authority to Earth. As Clarke searches for her parents and Wells struggles to lead, the Hundred must defend the freedom they have only just begun to build.
Rebellion
by Kass Morgan
2016
The young survivors have begun building a life on Earth when a fanatical cult starts capturing their friends. Clarke, Bellamy, Glass, and Wells face hard choices as they fight to protect their community from a threat that claims to heal the planet.
The 100 books in chronological order
Day 21
by Kass Morgan
2014The 100, Book 2
Series background & context
Kass Morgan's The 100 is a four-book young adult science-fiction series about what happens when the last remnants of humanity try to return home. Centuries after nuclear war made Earth unlivable, people survive aboard spaceships high above the planet. When resources and patience run short, one hundred teenage prisoners are sent down first.
They are supposed to test whether Earth can support life. Instead, they find a beautiful, dangerous world that does not follow the rules they knew in space.
The story moves among several points of view. Clarke carries the weight of a past crime and the skills to help the injured. Wells is the chancellor's son, but his connection to power does not make leadership easy. Bellamy forces his way onto the transport to protect his sister, Octavia. Glass remains on the Colony, where the threat of failing oxygen and strict social rules makes life above Earth just as tense as life below it.
The first book, The 100, sets up the mission and the secrets each character brings with them. Day 21 widens the danger as the group learns they may not be alone on Earth. In Homecoming, new arrivals from space upset the fragile balance the teenagers have created. Rebellion puts their hard-won community under pressure from a new and frightening enemy.
At its center, this is a survival story, but the practical problems are only half the battle. The young colonists must decide who can be trusted, how much freedom a community can allow, and whether the old system deserves to be rebuilt. Romance, family loyalty, class divisions, and buried mistakes all shape the choices they make.
The books inspired a television series, but the novels tell their own version of the premise. Readers familiar with the screen adaptation should expect different character arcs and story turns.
Expect fast chapters, several narrators, and plenty of emotional friction alongside the post-apocalyptic adventure. Start with The 100 and read in publication order, since each installment builds directly on the changes and revelations of the one before it.
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