"Gadzooks . . . you astonish me!" cries Mr. Lenville in Charles Dickens' Nicholas Nickleby. We won't accuse Dickens of gadzookery ("the bane of historical fiction," as historical novelist John Vernon once called it), because we assume people actually said gadzooks back in the 1830s. That mild oath is an old-fashioned euphemism, so it is thought, for "God's hooks" (a reference, supposedly, to the nails of the Crucifixion). Today's historical novelists must toe a fine line, avoiding anachronistic expressions while at the same time rejecting modern expressions such as okay and nice (the latter, in Shakespeare's day, suggesting one who was wanton or dissolute rather than pleasant, kind, or respectable).