Zoe Danton believed in her wedding vows, but one month after saying 'I do,' her husband is gone after she discovers a devastating secret. With her heart broken, she is returning the wedding gifts and finds a husband-shaped space next to her in bed. As teenagers facing a crushing loss, Zoe and her three sisters made a pact to stick together no matter what. Now, Zoe has discovered that one of them may have been the reason her husband betrayed her. Faced with the question, 'Which one of you slept with my husband?', Zoe realizes she has lost her happy-ever-after, and may have lost a sister, too.