Harry Dane lives an ordinary life. From his days working alongside his father at a New England general store, to Harry's endearing and heartbreaking relationships, to sudden snowstorms, to quirky fiascos of found kittens and spilled jam jars, always ... always there is a curious constant.

Through it all, each and every winter, a Christmas card arrives at Harry's Craftsman bungalow from a mysterious woman named Sadie Welles. And when the two of them unexpectedly meet, Harry Dane soon finds himself in an intricate love story spanning Eighteen Winters.