Love Me, If You Dare by Alyssa Clarke

Sebastian Crawford, Duke of Hartford, only cares about duty, honor, and family. He has everything planned: his sister is engaged, and he too will select his duchess from a list of eligible debutantes. The last thing he expects is his sister to go missing a few weeks before her wedding!

Lady Theodosia Winfern hardly knew what to do with herself when a devilishly attractive duke accuses her of persuading his sister to run away from her duties. When he declares Theo will not leave his side (even if it means sleeping in his chamber) until his sister is found, Theo has little choice but to go along with his scandalous demands. The last thing she wants is the powerful duke as her enemy, not when he knows about her secret lady’s club! Both are quick to deny the increasingly fiery attraction between them until temptation becomes irresistible and passion can no longer be denied…