Night of Sin — Julia Ross

Years of roaming the Far East have turned Lord Jonathan Devoran St. George into an intrepid, solitary world traveler, estranged from family and homeland. Yet the theft of a precious fossil has forced Jack back to England. The thief has planted the prize on an unsuspecting young woman, innocently minding her own business. Seconds later, the man is murdered--and Miss Anne Marsh becomes the unknown killer's next target.

Jack sweeps Anne off to his ancestral estate, all in the name of protecting her. Safely engaged to another, she's never met anyone like wild Lord Jack. Trapped in this handsome aristocrat's company, she seizes the chance to learn something new--about the world, about love, and about wickedness.