Peggy Sue Bodell, a middle-aged woman facing a crumbling marriage and the complexities of life, attends her 25-year high school reunion. Overwhelmed by nostalgia and the weight of her unfulfilled dreams, she faints during the event. Upon awakening, she discovers she has been mysteriously transported back to her senior year in high school in 1960, with all her adult memories intact. Confronted with the chance to relive her past, Peggy Sue grapples with the decisions that shaped her life and the possibility of altering her future.

Reconnecting with her youthful friends and her teenage sweetheart, Charlie, Peggy Sue faces both exhilarating and confusing encounters. Presented with the opportunity to change her fate, she must navigate the complexities of her relationships, family, and emerging sense of self. The journey becomes an introspective adventure as she weighs the importance of choices and the essence of true happiness.