After her fiance sleeps with a celebrity on his free pass list, Abby Meyers, with nothing but five names and a fantasy shared by millions, sets out for Los Angeles to sleep with someone from hers.
A young woman working her first night shift at a remote motel begins to suspect that she is being followed by a dangerous character from her past. As the night progresses and increasingly supernatural events occur, she quickly finds out that nothing is what it appears to be.
Finding herself the victim of a violent monster attack, Jane launches a vigilante campaign to hunt the beast that tried to kill her. Jane's efforts intensify, but her troubling history of drug use and mental illness bubbles to the surface causing her family, community, and authorities to question the authenticity of her account. Suddenly alone in her fight, Jane starts to doubt her own memory of the attack...to doubt if Monster exists at all.