In a world where being thin is the only thing that matters, Carrie King is a rebel. She's a member of the Chunky Cyclists Club, and she's proud of her fat body. So when the government makes a new weight loss drug mandatory, Carrie refuses to take it. Instead, she escapes and hides in the woods. But fatphobia is spreading. Society is breaking down. Thin people are dying. Can Carrie find the courage to rescue her friends and save the world from the zombie-like effects of the drug?