Room is more than the title of one of the year’s most powerful movies — it’s a state of mind that’s unbearably tense and as claustrophobic as a straitjacket

Room is simply a movie about mother and son trying to adapt to the outside world after years of forced captivity. And the surprise is how succinctly it captures this drastic life change from the perspective of five-year-old.

Director Lenny Abrahamson seamlessly translates Donoghue's work into cinematic terms with his relentlessly compelling adaptation. However, the drama owes just as much to its two stars, Brie Larson and newcomer Jacob Tremblay, whose textured performances turn outrageous circumstances into a tense and surprisingly credible survival tale.

The film, never sensational or saccharine, is a tough but tender tribute to the creative power of maternal love.

There are some plausibility issues in Room, but this is a disturbing and absorbing film, shrewdly acted, particularly by Larson. It lets the audience in; it does not just let the nightmare stun them into submission. You make a real emotional engagement.