In the quiet town of Willow Creek, librarian Ellie Harper discovers hidden love letters and mementos left by her grandmother Rose and a man named Elias, hidden behind a moonlit window and scattered across town. With new neighbor Jack Riley—an amateur astronomer and Elias’s grandson—Ellie follows the clues through old mills and apple trees, uncovering a decades-old romance that never faded. Amid laughter, small-town mishaps, and tender revelations, Ellie and Jack find their own second-chance love story written in moonlight and starlight.