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Toiling by day at an insurance agency in the 1970s, Tom Clancy dreamed of writing bestselling action thrillers.

Novelist Hilary Boyd is a grandmother. But don't let her catch you uttering the term "gran lit." That's the genre name that U.K. Observer columnist Robert McCrumb coined on reading Boyd's first published novel, Thursdays in the Park, in which middle-aged wife Jeanie begins an extra-marital…