Disgraceful Mr. Ravenhurst (Harlequin Historical #951)

Stumbling upon his dowdy cousin Elinor on the Continent, Theo Ravenhurst hardly believes his luck. His dangerous lifestyle appears to have finally caught up with him, and her family connections could be put to excellent use….

Theo is convinced Elinor's drab exterior disguises a fiery, passionate nature. He gives her the adventure she's been yearning for—and along the way discovers his newfound accomplice has talents beyond his wildest imagination!