The maxim that you can never be too rich or too thin does not apply to novels. Sin has an unfortunate combination of opulent setting and anorectic narrative style: ”There was anger. His awful anger. A different rage. Internal. Against himself.” Josephine Hart, author of the best-selling Damage, unfurls another tale of sexual obsession and elegantly repressed hatreds in a wealthy, well-bred British family. Are the two cousins, one blond and innocent, the other dark and brooding, two aspects of a single woman? Hart puts them through their nasty paces at such a terse, rapid clip, and gives them so many trumped-up tragedies, that we don’t really care. C