Humanity is returning home. Weeks after landing on Earth, the 100 have managed to create a sense of order amid a wild and chaotic environment. But their fragile balance is shattered by the arrival of new dropships from space. These newcomers are the luckiest—the settlement is running out of oxygen—but after they arrive safely on Earth, it becomes clear to Glass that her fortunes are running out. Clarke leads a rescue team to the dropship crash site, ready to treat the wounded, but she is unable to stop thinking about her parents, who may still be alive. Meanwhile, Wells struggles to maintain his authority despite the presence of the Vice Chancellor and his armed guards. Bellamy must decide whether to confront or run away from the crimes he believes he has left behind. It is time for the 100 to unite and fight for the freedom they found on Earth, or risk losing everything—and everyone—they love. "Fast-paced and gripping... many interesting issues seem to arise in this post-apocalyptic society." - The Bookbag "Dark and gripping... a mix of Prince of the Flies, Across the Universe, and The Hunger Games." - Booklist "Kass Morgan's weaving of pop culture elements with politics makes her work a particularly compelling read." - School Library Journal "Fans of The Hunger Games will fall in love with this series."