Focus Features has released a teaser trailer for the upcoming horror sequel "Insidious: Chapter 3" starring Dermot Mulroney, Stefanie Scott, Lin Shaye, Angus Sampson, and Leigh Whannell.The film is written and directed by Leigh Whannell.In "Insidious: Chapter 3," a twisted new tale of terror begins for a teenage girl and her family , predating the haunting of the Lambert family in the earlier movies and revealing more mysteries of the otherworldly realm The Further.