Jemma has spent her life scavenging tools and supplies for her tribe in the their small enclave outside what used to be a big city. Now she’s a teen, and old enough to become a Mama. Making babies is how her people survive—in Jemma’s world, life ends at age seventeen. Survival has eclipsed love ever since the Parents died of a mysterious plague. But Jemma’s connection to a boy named Apple is stronger than her duty as a Mama. Forced to leave, Jemma and Apple are joined in exile by a mysterious boy who claims to know what is causing them to die. The world is crumbling around them, and their time is running out. Is this truly the End?

In Scorpion, the sequel to Jeff Sweat's YA futuristic thriller Mayfly, Jemma, Lady, and Pico all left the Holy Wood to seek answers to the End, and when they find the Old Guys—the only adults to have survived the original wipeout of everyone over the age of seventeen—they think they've found help at last. But there's a lot the Old Guys aren't telling them. In fact, some of them don't seem interested in solving the End at all and just want Jemma and her friends to leave. Meanwhile, war is brewing among the tribes of the rest of the Children. Jemma's old home has fallen into disorder, and is far from prepared for battle. It won't be long before the fighting reaches Jemma and the Old Guys, if they even live to see it.