Yolanda Cicerón’s life in the Valley is brutal and harsh. She dreams of leaving her farm to live in Silo – the most advanced town for miles around. But first, Yoly will need to prove she belongs in a place where only the smartest and most useful are welcomed. Between her razor-sharp smarts and sheer determination, Yoly is well on her way to leaving her farm life when she discovers her family can no longer afford her schooling. Desperate for a solution, Yoly is forced to take matters into her own hands, but the closer she gets to securing her future, the more she uncovers the dangers lying inside Silo’s walls – ones that threaten the entire Valley. As she cracks long guarded secrets, Yoly along with those closest to her are put in grave peril and the only chance of surviving may lie in the rediscovery of a long extinct species–the honeybee.