The film follows a corporate climber (Nichols) who gets stuck working late on Christmas Eve and finds herself the target of an unhinged security guard (Bentley). With no help in sight, the woman must overcome physical and psychological challenges to surviveThat harrowing experience begins with an invitation for a holiday dinner [from a security guard named Thomas], at which point [Angela] finds herself viciously beaten into unconsciousness and handcuffed in his office. As it turns out his dinner invitation was not optional, and it's going to involve a lot more than a meal. If Angela wants to live to see Christmas morning, she must find a way to escape from the parking garage. With no help in sight, Angela must overcome unnerving physical and psychological challenges to survive.