Book on the "Underground Railway."

Eric Foner is one of my favorite historian/writers.  He penetrates to the key issues while others push their ideological hobby-horses, fawn over or hate the historical figure, or get lost in the detail.  His "The Fiery Trial: Abraham Lincoln and American Slavery" won a Pulitzer Prize. This is his latest book on the Underground Railroad "Gateway to Freedom:  The Hidden History of the Underground Railroad." (NYT BR here.)  Hope to get to it somedayk.