Jack is a spirited 5 year-old who is looked after by his loving and devoted Ma while they are confined in a windowless 10-by-10-foot 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 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 be the scariest thing yet: the real world.