There is no such thing as peace on this Earth. It has been a month since the last dropships landed, and the remaining settlers joined the One Hundred on Earth. The teenagers once dismissed as delinquents are now the leaders of their people, and their unity should be celebrated once again. But a new threat doesn't give them a chance: a fanatical cult has decided to mobilize its forces to "heal" the war-ravaged planet... by eliminating everyone else on its surface. After capturing dozens of their friends, Clarke sets out to free them, confident that she can reason with these strangers. Bellamy has a different plan; he won't let anything—or anyone—stand in the way of saving those he loves. Terrorized by their captive friends, Glass falls under the cult's alluring message, and Wells must relearn leadership skills. If a rescue team doesn't arrive soon, their friends face a fate unimaginable and terrifying. If the 100 wish to call this dangerous planet home, they need to put aside their differences and fight together to protect themselves and their planet. "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 compelling read." - School Library Journal "Fans of The Hunger Games will fall in love with this series."