When downtrodden checkout assistant Bonnie Green receives a letter from a mysterious uncle, she can hardly believe her eyes.

Gifted a hundred-year lease on a famous cafe situated in the middle of a mythical theme park, Bonnie sets off with her best friend Debbie on an adventure to a hidden valley in the Lake District where they will find new friendship, love, and happiness, all set against the magic of Christmas ... and more marshmallows than they can possibly eat....