The 2011 Sundance Film Festival has added another world premiere. Silent House, a thriller by Chris Kentis and Laura Lau will debut out of competition in the Midnight section. It’s a return to the festival for the filmmakers, who brought Open Water to the festival in 2004 and watched it become a sleeper success. The new film is described as a descent into madness, based on the Uruguayan film La Casa Muda. It stars Elizabeth Olsen. There are now a total of 118 feature films slated for the Park City festival.