The Lies of Lord John by Fiona Monroe

Highland Rogues - Book 5

They have nothing in common… Pretty, clever, and independently wealthy Margaret Bell lives just as she pleases in Regency Edinburgh’s gracious New Town, until her indulgent uncle marries a pious widow with strict ideas about how a young lady ought to behave. Only marriage can offer an immediate escape. Lord John Dunwoodie, rakish younger brother of the Marquess of Crieff, is at the end of his tether. A family quarrel has left him homeless and penniless, and the secrets of his past are catching up with him. Only marriage to a lady of fortune can save him. With nothing in common but desperation, can Margaret and Lord John find love together?