When Bea Bishop slips while walking down the aisle on her wedding day, she is momentarily knocked unconscious. And in a flash, her world splits and two separate parallel lives take her on two very different journeys. In one, Bea flees back down the aisle and out of the church. In the other, she glides blissfully towards Adam, her intended. Each path will see her life change for better and for worse. But which story will lead to her happy-ever-after?