Nothing could change him for the better. Save perhaps her. Seductive as a deadly sin Lucien Wrenn the Duke of Luhst can tempt any lady into his bed. But his best friend’s little sister—bluestocking scientist Lady Chasity Perrin—is forbidden fruit. And he’s spent a lifetime aching to take a bite. Chastity has always loved Lucien but the thoughtful boy she cherished grew into a careless rogue. Content with her lot as a spinster she fights to advance her medical research in a world that denies women's place in science. They can never be together until they clash in a heated argument and make a scandalous wager… During a month-long house party both must do the impossible: sinful Lucien must remain celibate and wallflower Chastity must secure a marriage proposal. When every eligible bachelor begins to compete for made-over Chastity Lucien burns to claim her as his own. As summer storm traps them no vow of friendship can hold him back from breaking