Shenanigans in Berkeley Square - The Scoundrel of Mayfair, #3

The right man doesn't know she's alive. The wrong man's out to change that. Coralie Busche can only admire Kenneth Rainier from afar. He's a most handsome philosopher of the Romantic movement and for months she's eavesdropped on his conversations at the coffee house. If only she had the courage to join his debates. however, her feminine education of singing and sewing could be of no interest to such a man.
But then that vexing rake, the Duke of Cumberland, brings her to Rainier's attention, and she can't hide any longer. Rainier has lived with his mercenary sisters for too long to suffer any illusions about women. They value money, position, and precedence, not life's important things such as poetry or painting, and only very lucky men find true love. But when he notices Cumberland staring at a dark-eyed beauty hiding in the coffee house's corner, Rainier is smitten.
Perhaps there's a chance he could be one of those lucky men. Cinderella meets Romeo and Juliet with a gorgeous gown, an unusual ducal matchmaker with motives of his own, and two cynical, jealous sisters. With All Hallow's Eve approaching, tempers flaring, and a duelist's challenge thrown down, how can His Grace, the Scoundrel of Mayfair, teach some loving sense to two soaring sensibilities?