Years later, with the deadline of their 30th birthdays approaching, the unlikely couple decide to keep their teenage promise. After all, they are such good friends. Surely that’s enough to make a marriage? Now, on the eve of their 10th wedding anniversary, they will discover that love between men and women is more complex, and more… precarious, than they could ever have imagined. As Kate struggles with a secret that reaches far into their past, will the couple’s vow become the very thing that threatens their future?