In the final chapter of the popular teen romance series directed by Vince Marcello, Elle (Joey King) faces her most challenging summer yet. With her long-term boyfriend Noah (Jacob Elordi) heading off to Harvard and her lifelong best friend Lee (Joel Courtney) committed to Berkeley, Elle is determined to fulfill a childhood pact to have the ultimate summer together before they all go their separate ways. This plan becomes complicated by her deepening connection with the charming Marco (Taylor Zakhar Perez), which forces her to confront difficult choices about her future and her heart. Throughout this emotional journey, she leans on the guidance of her mother (Molly Ringwald), whose support is crucial as Elle navigates the bittersweet transition from high school to adulthood, trying to keep her most important relationships intact while figuring out who she truly wants to be.