"Seven years ago, the Ballastian sisters' parents left them in the magical Straygarden Place, a house surrounded by tall silver grass and floating trees. They left behind a warning saying never to leave the house or go into the grass . . . Ever since then, the house itself has taken care of Winnow, Mayhap, and Pavonine--feeding them, clothing them, even keeping them company--while the girls have waited and grown up and played a guessing game [that involves thinking of animals, people, places, and faces]. Until one day, when the eldest, fourteen-year-old Winnow, does the unthinkable and goes outside into the grass, and everything twelve-year-old Mayhap thought she knew about her home, her family, and even herself starts to unravel." -- Adapted from Amazon.