When Calder Bailey's parents divorce and her mother needs some time to put her house in order, Calder is dismayed to learn that she's expected to leave her California neighborhood to stay with her grandmother in Weldon, a village in Vermont. When Calder discovers a mysterious rock, an enormous green and strangely shaped serpentine boulder in the deep woods above town, she is drawn into friendships with Walt, a boy whose family owns the rock and the...