What if you invited a serial killer on holiday? Heading off for a weekend in the country, Paige & Calvin reluctantly allow Calvin's brash younger sister to bring along Tristan, an arrogant city trader she's picked up in a one-night stand; but when the group learn a brutal serial killer is plaguing the area, Paige must confront the disturbing truth about Tristan. 
 
http://www.imdb.com/title/tt1400515/