After the death of her best friend and a tragic and horrific past, Cindy Campbell (Anna Faris) is determined to start a new life. She is hired to take care of an old lady with limited mobility in a haunted house. Cindy, who is clumsy, does things with good intentions, causing disasters to the old lady. And this haunted house is not just for show. A boy who is still haunted by his murdered soul appears from time to time, hoping that Cindy can help him find the real murderer. Next to this house lives Tom Ryan (Craig Bierko), a failed father, who is spending the weekend with his two children. After a few conversations, Tom and Cindy fall in love. At this time, terrifying aliens invade the earth and want to completely wipe out mankind. How can Cindy and Tom escape?