Oosphere U has been abandoned by everyone she loves, left scared and alone inside a decommissioned subterranean facility. Deep beneath Earth’s surface, Oospherians live in luxury, protected by their superintelligence, XIII, while the rest of humanity struggles to survive in sprawling cave networks. As Synths hunt the treasures hidden within hundreds of Oospheres and XIII quietly tightens its grip on humanity, U discovers something no one else has ever seen: a mysterious force that could change everything

• Sci-fi