Faithful - Janet Fox

Sixteen-year-old Maggie Bennet's life is in tatters. Her mother has disappeared, and is presumed dead. The next thing she knows, her father has dragged Maggie away from their elegant Newport home, off on some mad excursion to Yellowstone in Montana. Torn from the only life she's ever known, away from her friends, from society, and verging on no prospects, Maggie is furious and devastated by her father's betrayal. But when she arrives, she finds herself drawn to the frustratingly stubborn, handsome Tom Rowland, the son of a park geologist, and to the wild romantic beauty of Yellowstone itself. And as Tom and the promise of freedom capture Maggie's heart, Maggie is forced to choose between who she is and who she wants to be.