It is 1848. On one side of the Mason-Dixon Line lives 15-year-old Willow, her master’s favorite servant. She’s been taught to read and has learned to write. She is permitted to spend much of her time riding her horse to the riverbank, where she writes letters to her dead mother. On the other side of the line is 17-year-old Cato, a black man, free born. It’s his personal mission to sneak as many fugitive slaves to freedom as he can. When Willow’s and Cato’s lives intersect, they will discover the true meanings of bondage and freedom, of family and love.