At the wedding of Alix Madsen and Jared Montgomery, Jared's cousin Graydon can't look away from bridesmaid, Toby Wyndam. It's not just her quiet beauty or humour - Toby possesses the truly remarkable ability of being able to distinguish Graydon from his identical twin brother, Rory. According to family legend, such a gift marks her as Graydon's True Love. Graydon is heir to the Lanconian throne and must to marry a noble woman who has been chosen for him. Yet, intrigued by Toby, he asks her to help him hide on Nantucket for a week away from regal responsibilities. Knowing their union to be impossible, they promise to simply be friends. But there are forces at work beyond their control, which are ruled by time itself and a seductive spell is cast over Graydon and Toby. If they are to be together, they must change what once was, as well as what will be.