Long-time couple Megan Givens and Tom Prescott are preparing for what should be the happiest weekend of their lives. But their plans for a perfect wedding are ruined when a huge fight causes them to call it all off on the night of their rehearsal dinner. Megan and Tom think the worst is over - until they wake up the next morning and find themselves stuck in a time loop. Somehow they are being forced to relive the worst day of their lives - with its painful secrets, age-old grievances, and family dramas - again and again.