Delia Sherman’s 2011 The Freedom Maze is a stand-alone young-adult time travel novel.
1960: Young Sophie Martineau is dragged by her mother, fleeing the embarrassment of divorce, to Oak Cottage in Louisiana. Oak Cottage is a last remnant of lost Fairchild wealth, which has dramatically dwindled after a century of setbacks. Sophie is not pleased to be spending her summer there with her maternal relatives.
Seeking escape from her grandmother’s nostalgic tales of “the good old days before the war of northern aggression,” uncomfortable hearing about adult disquiet over desegregated schools, Sophie explores the land around Oak Cottage. She makes a momentous discovery with extraordinary consequences.