At Heaven's Gate, Robert Penn Warren's second novel, is a neglected classic of twentieth-century fiction. First published in 1943, it grew out of the author's years in Nashville during a period of political and financial scandals much like those later so memorably portrayed his Pulitzer-Prize-winning All The King's Men. Other formative elements, as he has said, "came originally out of Dante by a winding path." During the winter of 1939-40 in Rome,...