The Seers of Grampian Series by Elizabeth Thornton

James Burnett is a widower who's given up hope of finding someone to share his life with. He did, however, once have a lover he later dubbed Faithless McBride. For eight years, he'd suppressed thoughts of Faith McBride's abandonment with whiskey and women. That is, until visions of her imminent death started to haunt him. Only James can save her from a killer; but can Faith trust the one man who destroyed her faith in love?

After a mysterious woman foils an assassination attempt on the Queen's life, Alex Hepburn, a psychic agent for Her Majesty's Secret Service, recognizes the bold beauty as a conspirator he's been hunting for years.

When those around her begin meeting tragic fates, Kate Cameron knows she's next-until she's rescued by psychic Gavin Hepburn. But after a night of hiding together, Kate is branded a fallen woman and forced into marriage with Gavin-an arrangement that suits Gavin's purpose to do anything it takes to keep Kate safe from a killer haunting her past. For this enigmatic and lonely beauty has become the unexpected love of his life.