Dark Angel — Sally Beauman

A potent love story, a dark psychological thriller, an opulent family drama set amid the sensual abandon of Edwardian England... At its center if Constance, whose every loving impulse turns to destruction. A sullen waif grown to dazzling womanhood, Constance Shawcross becomes the protegee of the wealthy Cavendish family at their great estate, Winterscombe. There she learns to love privilege -- and to weave deceptions. She discovers the allure of her own seductiveness, and she makes a glittering marriage to the one man who loves her inspite of her lies -- or perhaps because of them....