Isabel, a forty-year-old woman, measured her successes and failures against her perfect sister Natalies. But after Natalie is murdered by her husband, Isabels identity unravels as she picks up the pieces of her sisters life and becomes the mother substitute for Natalies daughter. While Isabel tries to understand how Natalies life spiraled out of control, she develops feelings for a horse trainer named Sam. As Isabel discovers that her sister was having an affair, Isabel and Sam begin a relationship of their own. However, conflicts arise when clues implicate Sam as Natalies lover. Isabel retreats, and realizes she will have to stop seeing Sam unless she can prove that he wasnt involved Natalie. She is about to call it quits when Sam reveals the truth about his past. Isabel is then pretty sure he wasnt involved with Natalie, but shes still afraid to trust.