With Christmas only three days away, Carol Claus agrees to her father's request that she leave the North Pole on a mission to help save Christmas. Joining single father Ben Hanson and his children for the holidays seems an easy enough task until Santa informs her that Ben is the man behind the disturbing new book Beyond Bah Humbug: Why Lying to Your Children about Santa Claus Is a Bad Idea.

Posing as Miss Kane, the children's new nanny, Carol pulls out all the stops to show Ben how fun Christmas can be, all the while struggling to understand how one man could hate the holidays so much. How could she, Santa's only daughter, be so attracted to a man who refuses to believe her father exists?