Museum curator Annie Bristow has spent years regretting a marriage proposal she turned down from her college sweetheart. When a fateful ride on a holiday train gives Annie the opportunity to make it right, she wishes for a do-over. She wants to go back and say yes to her one true love. Who better than a twinkly-eyed Mrs. Claus to make it happen? What could possibly go wrong?

Getting a second chance at love should’ve been a dream come true. But when Annie wakes up married to the wrong ex-boyfriend, she’ll have to pretend to be Mrs. Holden Thomas until the holiday train returns on Christmas Day. She’s determined to find a way to reunite with the right true love, but obstacles keep foiling her efforts. Like Holden being frustratingly handsome and unexpectedly charming. This quiet man holds onto a painful past of his own, and Annie finds herself drawn to the life Holden has built. But falling for him is so not part of the plan…

The countdown is on, and love is at stake. When Christmas morning arrives, will Annie return to her old life? Or say ‘I do” to the one man she never wished for?