Herman Melville's epic tale of obsession has all the ingredients of a first rate drama--fascinating characters in solitude and society, battles between good and evil, a thrilling chase to the death--and yet its allusions, digressions, and sheer scope can prove daunting to even the most intrepid reader. George Cotkin's Dive Deeper provides both a guide to the novel and a record of its dazzling cultural train. It supplies easy-to-follow plot points...