Marlo, a mother of three including a newborn, is gifted a night nanny by her brother. Hesitant to the extravagance at first, Marlo comes to form a bond with the thoughtful, surprising, and sometimes challenging nanny named Tully.
Tully Jr. and Earl live on their father's Nebraska ranch, proud and independent to a fault. While the shy, reclusive Earl spends his free time watching movies, the cockier Tully works his way through a succession of short-term affairs and an off-again, on-again relationship with April, a stripper in town. When their childhood friend Ella returns to town to start a veterinary practice, however, Tully falls for her -- although the townsfolk have their doubts that he could ever commit to one woman.