Underground Airlines‘ alternate history (see First‘s review above) calls to mind Sydney Nathans’ actual history, To Free a Family: The Journey of Mary Walker (2012). That journey began when Mary Walker ran away from bondage, leaving three children behind (along with her mother) after her master announced he planned to send his “impudent” slave to a plantation in Alabama, far removed from her family in North Carolina. Once Mary Walker got settled in the North, she spent years trying to free her family and Nathan provides a gripping chronicle of her efforts. (Struck by the drama of the book and its cast of characters, more than one reader has invoked Dickens.)