The Duke and the Thief by Ashe Barker

Twenty-one-year-old Eloise Smith has developed a habit of stealing trinkets and other seemingly unimportant items from anyone who gets close to her, but when a gentleman who introduces himself as the Duke of Savoy takes an interest in Eloise he decides to put a stop to her thieving.
Though Adam Dacre didn’t plan to fall in love with Eloise, he quickly finds himself wanting to claim the beautiful miscreant and make her his bride. But he is a man with a secret of his own…