"Firefly Lane" by Kristin Hannah is a story that chronicles the decades-long friendship between two women, Tully Hart and Kate Mularkey, beginning when they meet as preteens in the 1970s. Tully is the glamorous, ambitious one who longs for success, while Kate is the shy, awkward one who desires an ordinary life with love and family. Inseparable through college and their careers, they navigate the storms of friendship, including jealousy, anger, and resentment, for thirty years. Their bond is ultimately tested by a single act of betrayal, forcing them to confront the strength and limits of their lifelong friendship.