During a house visit, a young couple and a real state agent are surprised by the sudden invasion of an old men and his grand daughter. They broke into the house asking for help and saying they're in danger. The couple decides to help them, however, this might not be the best choice. After sunset the girl transforms herself into a perilous creature turning the couple's night in to a living nightmare. They must endure this situation until dawn if they want to get out alive.