As Norah battles through the bustling December crowds, she hears the notes of a song that transports her back to the most romantic week of her life.

After meeting on a blissful holiday, but knowing they had to part, a boy named Andrew made her a promise: If they are both single on Christmas Eve in ten years' time, they will meet under the clock on Grafton Street, Dublin. Norah has no idea if he will remember, but she has nothing to lose. So, hoping for a Christmas miracle, she heads to Dublin. To that clock. And, maybe, to Andrew. But it wouldn't be Christmas without a few surprises.