If Will Fletcher&’s severe bipolar disorder isn&’t proof he shouldn&’t be a parent, his infant daughter&’s grave is. Once a happily married, successful veterinarian, he now lives with his sister and thrives as the small-town crazy of Half Moon Hollow. But when a fifteen-year-old orphan claims she&’s his daughter, Will is forced back into the role he fears most: fatherhood. Her biological dad isn&’t the hero Regan Whitmer hoped for, but he&’s better than her abusive stepfather back in Chicago. Still haunted by her mother&’s suicide and the rebellious past she fears led to it, Regan is desperate for a stable home and a normal family—things Will can&’t offer. Can she ride the highs and lows of his illness to find a new definition of family? The Rules of Half explores what it is to be an atypical family in a small town and to be mentally ill in the wake of a tragedy—and who has the right to determine both.