The exhausting plenitude of loosely connected detail in Gravity's Rainbow makes it a favorite of postmodern critics, who claim it describes a modern, random, unknowable universe. Hume expands the possibilities as she discloses a mythic structure that underlies Pynchon's work and provides easier access to his world. "Myth turns chaos into cosmos," Hume explains, describing how the profuse detail of Pynchon's book allows for the creation...