When his girlfriend, Phoebe, is swamped with college exams; Tom O'Bannon, a rowdy pro-wrestler struggling to make ends meet, agrees to fill in as a last-minute replacement for her well paying babysitting job. Tom arrives at an isolated family home where he meets the precocious 10-year-old Grace. What starts off as a quiet night of pizza and video games quickly spirals into bloody, violent chaos as Tom and Grace find themselves fighting for their lives when an otherworldly cult of masked intruders descend on the home.

The film explores the world of firefighters in 1920s New York City and tells the story of a 16-year-old girl who will have to become a hero in order to save her city.