The Lion of Vane — Linda Parsons

Lily Wentworth made a deal with the devil. The devil came in the form of a man disguised in a great coat, wide brimmed top hat, red muffler, and named himself Mr. Shipley. Mr. Shipley would see Simon Morgan freed from prison and cleared of murder charges. In turn, Lily would assist Mr. Shipley with stopping the assignation of King George by a demented Frenchman.

Lily Wentworth's situation takes a deadly twist when she catches the eye of Lord Marcus Garrick, Duke of Vane.
Marcus must marry and post haste and he's set his sights on Lily. He's determined she'll be his duchess at any cost, even if it means turning to his long dormant Fey powers.