A young mother (Brie Larson, last seen in Trainwreck) and her 5-year-old son live in a 10-by-10-foot room, completely cut off from the outside word. Mom attempts to raise young Jack (incredible newcomer Jacob Tremblay) in the best way she can. But when things begin to change in Room, she concocts a plan for Jack to escape. What follows is a fascinating existential drama in which Jack's perception of the universe is suddenly and violently expanded beyond the four tiny walls he's known for his entire life. Director Lenny Abrahamson (who gave us the wonderfully weird musical drama Frank) infuses this claustrophobic drama about growth and change with a palpable tension. He's helped immensely by his two stars, who share a thoroughly believable mother-and-son chemistry.FULL REVIEW:Claustrophobic, mother-and-son drama traps the world between four walls by Devin D. O’Leary (11/19/2015). 118 minutes R.