Seventeen-year-old Kathy is smart, pretty, musically talented, and homeless. She and her little sister are two orphans on a train heading west from Boston in 1910 hoping an older sister will take them in. A kind Christian woman on the train invites them to live with her family. So many of Kathy's prayers are being answered. She is not looking for romance, but it quickly finds her. Kathy's musical ability and beautiful voice win over the woman's adult son who plays a fiddle. It seems all but certain that she will become the young man's bride, but life gets complicated. Will the rails that brought them together take her back never to return?