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As delicious as fizzy lemonade and only slightly more substantive, this novel by the screenwriter of “Gosford Park�� takes you through the courtship and marriage of a middle-class beauty (“I knew she was a social climber; I didn’t realize she was a mountaineer!��) and an aristocratic dullard. No one escapes the dry acerbity of author Julian Fellowes, who was born into the bosom of the upper-class and obviously knows the species intimately. A very light, very fun, very delectably waspish portrait of a class of people who are polar opposites of the type populating reality-TV.