Brie Larson and young Jacob Tremblay portray a mother and son trying to endure while trapped in captivity in the first trailer and poster for A24 Films' Room. Based on the best-selling novel by Emma Donoghue, Room is a unique and unexpectedly tender exploration of the boundless love between a mother and her child under the most harrowing of circumstances. A24 Films will release the adaptation in New York and Los Angeles theaters October 16, before expanding nationwide November 6.

Room tells the extraordinary story of Jack (Jacob Tremblay in a breakout performance), a spirited 5 year-old who is looked after by his loving and devoted Ma (Brie Larson, Short Term 12, Trainwreck). Like any good mother, Ma dedicates herself to keeping Jack happy and safe, nurturing him with warmth and love and doing typical things like playing games and telling stories. Their life, however, is anything but typical-they are trapped-confined to a windowless, 10-by-10-foot space, which Ma has euphemistically named "Room."

Ma has created a whole universe for Jack within Room, and she will stop at nothing to ensure that, even in this treacherous environment, Jack is able to live a complete and fulfilling life. But as Jack's curiosity about their situation grows, and Ma's resilience reaches its breaking point, they enact a risky plan to escape, ultimately bringing them face-to-face with what may turn out to be the scariest thing yet: the real world. Room also stars three-time Academy Award nominee Joan Allen and Academy Award nominee William H. Macy.

At once a taut narrative of captivity and freedom, an imaginative trip into the wonders of childhood, and a profound portrait of a family's bonds and fortitude, Room is a beautifully transcendent experience based on the award-winning global bestseller by Emma Donoghue. Director Lenny Abrahamson (Frank) remains faithful to the novel while bringing Jack, Ma and their entirely singular world to heart-pounding and intensely cinematic life. Room demonstrates the triumphant power of familial love even in the darkest of circumstances, and is sure to take its place among the most emotionally affecting films to ever explore the bond between parents and children.

The supporting cast is rounded out by Megan Park, Amanda Brugel, Sean Bridgers, Kate Drummond, Randal Edwards and Jack Fulton in this movie adaptation. While it's too early to tell now, Room could be an early Oscar contender when it hits theaters this fall. Check out the first footage with the new trailer, along with the poster, and stay tuned for more on Room.