At age thirty-one, American Charlotte Merryweather has spent ten years in London pursuing personal and professional perfection. Yet her present-day success—heading her own PR company, owning a gorgeous apartment, and planning a future with her devoted boyfriend—only heightens the shock of a visit from the past.

"Lottie," Charlotte's twenty-one-year-old self, drives onto the scene at the wheel of a rusty, orange Volkswagen Beetle identical to Charlotte's first UK ride. Charlotte pursues a friendship aimed to bestow upon Lottie a decade of wisdom. Yet Charlotte's prosperous polish proves a pale substitute for Lottie's innate, youthful graces—openness, passion, and kindness. Will the student become the teacher in this witty turnabout?