The Perfect Rake by Anne Gracie

Fate has lavished beauty on the Merridew sisters—that is, all save the eldest. But plain Prudence bears no grudge; she loves her four beautiful sisters infinitely. So when their abusive grandfather is laid up with an injury, she seizes the opportunity to concoct an ingenious plan that will allow all five of them to escape the clutches of their legal guardian. All it will take is a little matrimonial deception… A renowned rake, Gideon, Lord Carradice, has a way of making ladies swoon. But when Prudence arrives at his doorstep and mistakes him for his cousin, the Duke, it is Gideon who’s infatuated. The delightful spitfire claims she and the Duke are engaged—although a taller tale was never told. In spite of the lies, Gideon is so taken with charming Prudence that he’s eager to join her game, especially if it will award him a stolen kiss or two. Now, Prudence’s plot is about to go terribly, albeit deliciously, awry…