When 16-year-old Lily downloads a mysterious new app promising to "relax and focus the mind," she thinks it's the perfect way to unwind and handle her busy life. But as the soothing voice in her earbuds slowly takes control of her thoughts, Lily starts to lose grip on reality. Little by little, the app's commands become impossible to resist. By the time she realizes what's happening, it may already be too late. Who is really behind the app, and what do they want with her?