Know-it-all high school senior Annie Mills has always had a plan: to become the female Neil Armstrong and to be Margot Ellison's best friend forever. But when Margot decides the perfectly pious Mormon life isn't for her, it's not God Margot's running away from; it's Annie.

After her daughter Sophie goes off to college, single mother Elaine begins an unlikely friendship with a Taco Bell cashier, aka Sophie's ninth grade nemesis. Feeling more alone than ever before, Elaine asks her new friend to attend a wedding in Sophie's place-- if she pretends to be her daughter.

Three friends travel far and wide to reunite, leaving husbands, dependent adult children and elusive meditation retreats to do so. But when buried secrets threaten their perfect beach vacation, the women must fess up to their sins.