Sara Elliott has been forced to give up the life she's dreamed of to return home to Chicago and take charge of her sisters and brother. She finds a job and settles into the house she grew up in, building a life for ten-year-old Doug and teenagers Carrie and Abby. But Sara has another brother, Mack, now twenty, who left home three years earlier. Suddenly he reappears, cheerful and unconcerned, as if he had never broken his promise to stay and help Sara with the children and the house. With bewildering volatility, Mack swings from kindness to cruelty, affection to hostility, keeping the family always on edge, his past and present a mystery. But with expensive gifts, storytelling, and the excitement of his presence, he is winning over the children, and sometimes the four of them stand together against Sara.