Duke of Desire by Elizabeth Hoyt

A LADY OF LIGHT
Refined, kind, and intelligent, Lady Iris Jordan finds herself the unlikely target of a diabolical kidnapping. Her captors are the notoriously evil Lords of Chaos. When one of the masked-and nude!-Lords spirits her away to his carriage, she shoots him . . . only to find she may have been a trifle hasty.

A DUKE IN DEEPEST DARKNESS
Cynical, scarred, and brooding, Raphael de Chartres, the Duke of Dyemore, has made it his personal mission to infiltrate the Lords of Chaos and destroy them. Rescuing Lady Jordan was never in his plans. But now with the Lords out to kill them both, he has but one choice: marry the lady in order to keep her safe.

CAUGHT IN A WEB OF DANGER . . . AND DESIRE
Much to Raphael’s irritation, Iris insists on being the sort of duchess who involves herself in his life-and bed. Soon he’s drawn both to her quick wit and her fiery passion. But when Iris discovers that Raphael’s past may be even more dangerous than the present, she falters. Is their love strong enough to withstand not only the Lords of Chaos but also Raphael’s own demons?