I've read other books by this author and while it would have to be in the romance category, they are definitely NOT formula romance and therefore much more enjoyable.

From the back:

Since childhood Clare Royland has been haunted by dreams of Isobel, the countess of Buchan, mistress of Robert the Bruce. And now she has stumbled on a way to enter the past...a mysterious pathway into a misty era. Ignoring every warning, Clare will return to Duncairn, her family's castle in the Scottish highlands. And once there her life will become irrevocably linked to the fiery Isobel's as she is swept into a maelstrom of ancient treachery and modern hatred fueled by an insatiable hunger for power, and the raging passions of an undying love.