The story of sister and brother, Kate and Teddy Pierce, whose Christmas Eve plan to catch Santa Claus on camera turns into an unexpected journey that most kids could only dream about.

Competing in a Christmas baking competition in Belgravia, a Chicago baker bumps into the prince's fiancée--who looks just like her. They switch lives for two days.

A struggling but talented photographer inherits an antique holiday advent calendar, the contents of which seem to predict the future. Will this magical calendar lead her to love this holiday season?