It certainly makes for a good story: a scrappy kid from Baltimore flunks out of an English class at what is now Loyola University Maryland only to become an international bestselling author. The problem is that the oft-told tale concerning Tom Clancy is just as fictitious as Jack Ryan. “It was an urban legend that just wouldn’t die,” said Carol Abromaitis, the English professor accused of giving Clancy an F in her class. For decades, Abromaitis urged English majors to let others know the truth. Her efforts bore little fruit. “One major said to me, ‘Of course not. It makes...