On her tenth birthday, Maisie Day wakes up to find her house empty and the world outside vanishing into darkness. As she desperately searches for her missing family, she must also solve an impossible physics equation to save them. Maisie's story unfolds across two terrifying realities at once: one where science is breaking down, and another where she's trapped in a horrifying game. This mind-bending adventure blends science, mystery, and heart to explore the true nature of reality and the unbreakable power of family.