Freddy Melcher is obsessed with Santa Claus: he has posters, clothes, underwear, action figures, everything but a photograph of the real Santa--and though it will take planning, trip wires, and staying awake late, this year he is determined to get the ultimate selfie.

In 1974 Wales, thirteen-year-old Petra and her best friend Sharon are madly in love with David Cassidy and enter a contest whose winners will be flown to America to meet him. In 1998 London, Petra is on the brink of a divorce. While cleaning out her mother's closet, she finds the letter her mother intercepted declaring her the winner of the Cassidy contest. After 24 years, the girls head to Las Vegas to meet their teen idol.