Samantha, known as “Sam,” works at a crisis hotline, offering support to strangers grappling with their struggles. She is intimately familiar with such pain, as the hotline once saved her life after she lost her vision and was unsure how to navigate a world shrouded in darkness. On her final night at work, Sam is confronted by a chilling visit from one of her regular callers, who feels betrayed by her impending departure. This caller is not just any individual; he is a sadistic serial killer whom Sam has unknowingly prevented from committing suicide for over a year. With only a minimal staff on the night shift, there is little to protect Sam from him. He has come for her, determined to let nothing and no one obstruct his path. Will Sam endure the longest, most harrowing night of her life?