Cassidy Hancock hates being late—he's pathological about it. Until the crisp fall morning when he pauses to watch his neighbor's handsome son chase his dog down the sidewalk… and gets hit by a tree. Mark Taylor sees the whole thing, and as a second-year medical resident, he gets Cassidy top-notch care. In spite of himself, he's fascinated by his mother's stodgy neighbor, and as he strives to help Cassidy recover from a broken leg, he begins to realize that behind Cassidy's obsession with punctuality is the story of a lonely boy who thought he had to be perfect to be loved. Mark and his family are far from perfect—but they might be perfect for Cassidy. As the two of them get to know each other, Cassidy fantasizes about the family and happy-ever-after he never thought he'd have, and Mark starts to yearn for Cassidy's wide-eyed kindness and surprising creativity. But first they have to overcome Cassidy's fears, because there is so much more fun to be had during Christmas than just being on time.