In 1844, Alexandre Dumas published The Three Musketeers, a novel so famous and still so popular today that it scarcely needs introduction. Shortly thereafter he wrote a sequel, Twenty Years After. Later, toward the end of his career, Dumas wrote The Red Sphinx, another direct sequel to The Three Musketeers that begins a mere twenty days afterward. Picking up right where the The Three Musketeers left off, The Red Sphinx continues the stories of Cardinal...