Wes Craven\'s - Invitation to Hell (1984)

When the scientist and family man Matt Winslow finally accepts the invitation to work the Micro-Digitech Corporation in a space suit project, he moves with his beloved wife Patricia and their son Robbie and daughter Chrissy to a huge modern house in the corporation compound. They meet their friend Tom Peterson and his family completely adapted to the new lifestyle, and Tom invites the Winslow family to join the Steaming Springs Country Club. Tom tries to seduce Matt telling him that every member of the club has a meteoric professional ascension in Micro-Digitech, but Matt is not tempted with the offer. Later he is introduced to the director of the club, Jessica Jones that befriends Patricia and convinces her to join the club with her children. Matt feels the changing in the behavior of his family and decides to investigate the club, finding an evil secret about Jessica and the members.