Here's the Powerful Trailer For Room, Based on the Intense Bestselling Novel

Room is one of the many books becoming movies in 2015, and it's undoubtedly one of the most intense ones on the list. The film is based on the novel by Emma Donoghue, and it's about a 5-year-old boy (Jacob Tremblay) being cared for by "Ma," played by Brie Larson. All he knows is that they live in a room, but Ma knows they're actually being held captive. Larson's performance has been highly lauded since the film debuted at the Telluride Film Festival, and the buzz will probably only grow louder once it shows at the Toronto International Film Festival. The movie, out on Oct. 16, features a fantastic cast, and the trailer alone is incredibly gripping.

Here's the teaser: