In 2009, Walls published her first novel, Half Broke Horses: A True-Life Novel, based on the life of her grandmother Lily Casey Smith.
Only Fools and Horses | Two and a Half Men | Half Man Half Biscuit | Harry Potter and the Half-Blood Prince | Band of Horses | Half Moon Bay, California | Half-Life | Half Moon Bay | Hancock's Half Hour | Half-Life (video game) | It Ain't Half Hot Mum | Half-Life 2 | 2 Broke Girls | Harry Potter and the Half-Blood Prince (film) | Half the Sky: Turning Oppression into Opportunity for Women Worldwide | Half Dome | When the Levees Broke | half-time | Half Ticket | Half Japanese | Half Baked | A Year and a Half in the Life of Metallica | They Shoot Horses, Don't They? (film) | Robert Broke | Philip Broke | John Verney, 20th Baron Willoughby de Broke | How the Other Half Lives | Horses & Trees | Half-time | Half-orc |