Watch: Run, Jump, And Escape In New Trailer For 'Room' Starring Brie Larson

If Brie Larson showed she could play complex, lead characters with tremendous skill in "Short Term 12," by all accounts she takes it to the next level in "Room." Following a very well received premiere at the Telluride Film Festival, and with a Toronto International Film Festival bow just around the corner, A24 is putting out the word that you need to put this on your must-see list for the fall with a brand new trailer.

Directed by Lenny Abrahamson ("What Richard Did," "Frank") and based on the best-selling, acclaimed novel by Emma Donoghue, the story details the love between Ma, and her son Jack (Jacob Tremblay), who have been confined to a 10x10 foot room. And yet within those walls, Ma creates an entire world for Jack, until one day they plot escape, one that pitch her son into the real world for the first time. It's powerful stuff, and our critic in Telluride said in his review that the film "has unforgettable, must-witness...