A Duke's Guide to Romance. The Gentlemen Authors, #1

He only wanted to purchase a novel, now he's falling madly in love. Anthony Gibbs, Duke of Westcliffe, needs an income. Bills must be paid, appearances kept, and arrangements made for his sisters' debuts. In short, he must either marry or seek employment, neither of which sounds remotely compelling. But then he meets Ada and she suggests a third option. Now he's penning a novel while losing his heart to the bookish miss, a woman he cannot afford to marry unless he's prepared to make some difficult choices. Ada Quinn has no connections, no dowry, and consequently no prospects.
Her plan for the future is limited to her skill as a bookbinder. Until Mr. Gibbs walks into her uncle's bookshop and starts to romance her. Handsome, thoughtful, and utterly charming, Mr. Gibbs is precisely the sort of man Ada always dreamed of falling in love with. Until she discovers he's not who he claims to be and that he intends to marry another.