When Cara Rutledge rents out her quaint beach house on Isle of Palms to Heather Wyatt for the entire summer, it's a win-win by any standard. Cara generates income necessary to keep husband Brett's ecotourism boat business afloat, and anxiety-prone Heather, a young artist, has a quiet space in which to work. It isn't long, however, before both women's idyllic summers are altered irrevocably. When Cara's life reels with sudden tragedy, she wishes only to return to the beach house that had once been her port amidst life's storms. Heather refuses to budge from her newfound sanctuary, and so begins the unlikeliest of rooming situations. While they start out as strangers, as everything around the women falls apart they learn that the only thing they can really rely on is each other.