The Montague Scandal — Judith Harkness

The mysterious, handsome, and mocking Mr. Peter Grey warned Roselind against wanting to wed Reginald Darnley, sought-after as Darnley might be. The enchanting lovely, heartbreakingly tragic Maude Quimby warned Roselind against putting herself in Darnley's hands, generous as those hands might be. Roselind's own brother, Bertie, warned her against trading her freedom for a fortune, fabulous as that fortune certainly was. Even Roselind's own heart trembled with misgivings in Darnley's presence, no matter how polished his phrases and skillful his caresses.

Forewarned should have been forearmed -- but instead Roselind found herself defenseless against a man who might be a devil in disguise...and maddeningly confused about a certain mysteriously irresistible gentleman who somehow simply would not leave her thoughts.

Hero:
Heroine: Lady Rosalind Arden