Book excerpt: Kidnapped as a teenage girl, Ma has been locked inside a purpose built room in her captor's garden for seven years. Her five year old son, Jack, has no concept of the world outside and happily exists inside Room with the help of Ma's games and his vivid imagination where objects like Rug, Lamp and TV are his only friends. But for Ma the time has come to escape and face their biggest challenge to date: the world outside Room.