The Retreat (2005)
overview : A group of college students travels to the cottage of their psychology professor Barren in an isolated island as a reward of their teamwork in the research of Barren. They expect to spend the weekend with lots of sex, but a serial-killer turns their party in a nightmare.
Genres : Horror
Tags : sex, winter, island, college, research, teamwork, travel, serial killer, cottage, pretty girl, group of friends, isolated, retreat