一個年輕媽媽的牢籠，是她五歲兒子的全世界。

對傑克來說，房間就是他的整個世界，但對媽而言，卻是老尼克囚禁她七年的監獄。靠著決心、機智和強大的母愛，媽為傑克創造了人生。但她知道這樣是不夠的……對她不夠，對傑克也不夠。她想出一個大膽的脫逃計畫，需要仰賴她兒子的勇氣，以及大量的運氣。她沒想到的是，對這計畫一旦成功會產生什麼樣的後果，自己竟然沒有充分的準備。

To five-year-old-Jack, Room is the world. . . . It's where he was born, it's where he and his Ma eat and sleep and play and learn. At night, his Ma shuts him safely in the wardrobe, where he is meant to be asleep when Old Nick visits. 

Room is home to Jack, but to Ma it's the prison where she has been held for seven years. Through her fierce love for her son, she has created a life for him in this eleven-by-eleven-foot space. But with Jack's curiosity building alongside her own desperation, she knows that Room cannot contain either much longer.

Room is a tale at once shocking, riveting, exhilarating--a story of unconquerable love in harrowing circumstances, and of the diamond-hard bond between a mother and her child.