To five-year-old Jack, Room is the world. It’s where he was born. It’s where he and Ma eat and sleep and play and learn. There are endless wonders that let loose Jack’s imagination: the snake under Bed that he constructs out of eggshells; the imaginary world projected through the TV; the coziness of Wardrobe, where Ma tucks him in safely at night, in case Old Nick comes.Room is home to Jack, but to Ma, it’s the prison where she’s been held since she was nineteen—for seven lon