This summer marks the 25th anniversary of the completion of James Clavell’s epic Asian Saga—six novels, totaling 6,240 pages in paperback, published between 1962 and 1993. The high point of the saga was the publication in 1975 of Shōgun. Set in the year 1600, it chronicles the exploits—nautical, martial, political, and erotic—of John Blackthorne, a British seaman who finds himself shipwrecked in feudal Japan along with a few other survivors of the Erasmus, a Dutch pirate ship he helped pilot. By order of publication, Shōgun is the third book of the series, but by internal chronology it is the first. It is also, far and away, the most commercially successful book in the series. By 1980 it had sold more than 6 million copies and become the source of one of the most successful TV miniseries in history. It was preceded by King Rat (1962) and Tai-Pan (1966). It was followed by Noble House (1981), Whirlwind (1986) and Gai–Jin (1993). Grady Hendrix’s 2017 book Paperbacks From Hell admirably chronicles the way that a single novel—Ira Levin’s …