How do you cope in a world without your mother? When Barbara realizes time is running out, she writes letters to her four daughters, aware that they'll be facing the trials and triumphs of life without her at their side. But how can she leave them when they still have so much growing up to do? Take Lisa, in her midthirties but incapable of making a commitment; or Jennifer, trapped in a stale marriage and buttoned up so tight she could burst. Twentysomething...

One late wine-and gossip-fueled night, four friends on a lark create a fateful test of friendship-one that challenges the very principles and boundaries of their alliance. To pass it means to never, at any cost, betray one another. Twenty years later, they must face that ultimate test.