Kate (Sarah Chalke) and Tully (Katherine Heigl) meet as young girls and become inseparable best friends throughout thirty years of ups and downs, successes and failures, depression and disappointments. When an unthinkable betrayal breaks them apart, the two women go their separate ways and it’s unclear whether they will ever be able to reconcile. Based on the novel of the same name by New York Times bestselling author Kristin Hannah, "Firefly Lane".