As a new intern, Keely is shocked by the identity of her clinical instructor. It’s Zach—a friend of her brother’s, the man she was head over heels in love with when she was sixteen…and who rejected her marriage proposal. Zach lost his wife a year ago and is struggling with the care of their little girl. So Keely offers to help him with his daughter, but she also vows to herself not to fall in love with him again and to act like a sensible grown-up. As they spend time together, though, it becomes increasingly difficult for her to honor that vow…