Y/N is admitted to Blackthorne Institute, a strict private mental health facility where routine and control shape every part of life. Inside, she meets Prentice Rafferty and Leland Vesper—two patients who are just as complicated and unstable as she is. As relationships form and boundaries blur, Blackthorne becomes less about recovery and more about survival, connection, and control. In a place designed to contain chaos, attachment quickly becomes the most dangerous part.