Bargaining with a Rake — Julie Johnstone

For eleven years, Gillian Rutherford has dreamed of escaping her family's dark secret and living a normal life. Now, faced with an unwelcome marriage that will chain her to London and the secret slowly killing her, she's desperate to save herself and the sister she adores. Salvation comes in the form of an American shipping tycoon, and all she must do is seduce him into marrying her. But Gillian's scheme hits a snag when she makes a bargain with a notorious rake Alexander Trevelle, Lord Lionhurst. He'll help her win the hand of his American friend, if she'll assist him with exacting revenge against her unwanted fiancé. But the price of the pact may just be their hearts.