Undone — Virginia Henley

THE IMPOSTRESS
Though celebrated in Irish society for her extraordinary beauty, Elizabeth Gunning is just playing a part. The supposed daughter of Viscount Mayo is in fact a common woman of uncommon appearance. And if her domineering mother has her say, she is going to keep up the charade -- and take London society by storm.

THE DUCHESS
With her golden hair and violet eyes, Elizabeth has men falling at her feet, but only one has captured her heart -- John Campbell, the rakishly handsome Duke of Argyll. If she surrenders to his smoldering gaze and heated touch, she'll be playing with fire. Because only John knows her deepest secret -- and knows just how to unleash the passion within her...