Return of the Highlander by Sara Mackenzie

An Immortal Warrior: one given the power to make right what once went wrong … in a time not his own.

Bella Ryan writes about the past, and it is that past which has brought her to isolated Loch Fasail in Scotland. She wants to tell the story of the Black Maclean, an infamous figure in 18th century history, and so what if she’s a little bit obsessed with him and his portrait hangs on her wall. But when he begins to invade her dreams, she realizes that the man himself is trying to speak to her.
This is no fantasy lover, this is real. Maclean is alive.
Morven Maclean has returned from the dead, with the help of the Sorceress of the between-worlds. He must make retribution for the wrong he did in the past, with Bella at his side. At first invisible, with Bella’s aid he changes from a ghost to a man. A man who can touch her and kiss her, and make her his. But as their feelings grow, the evil from the past catches up with them.
Can they overcome the dangerous magic that surrounds them, and find a way to be together?