"What Happened to Goodbye" is a young adult novel written by Sarah Dessen. It tells the story of a teenage girl named Mclean Sweet, who has been constantly on the move with her father since her parents' divorce. Mclean has developed a habit of reinventing herself with each move, adopting a new persona in each town they settle in. When they move to the town of Lakeview, Mclean decides to try something different. Instead of assuming a new identity, she decides to just be herself. However, this proves to be challenging as she struggles to define who she really is amidst her parents' divorce and her own inner turmoil. Throughout the novel, Mclean navigates relationships with her father, her mother, and her new friends, including a boy named Dave. As she learns to confront her past and embrace her true self, Mclean discovers the importance of honesty, forgiveness, and the true meaning of home. Sarah Dessen is known for her relatable characters and heartfelt storytelling, and "What Happened to Goodbye" is no exception. The novel explores themes of identity, family, and self-discovery in a way that resonates with young adult readers.