Swept Away, by Marsha Canham - this is an indie published backlist book.
Book Description
Set in Regency England, a dangerous time of spies, treachery, and intrigue. A stranger has washed up on shore, half dead, with no memory of who he is or why he has been accused of treason. His only hope of avoiding death is a shadowy memory hovering just beyond his grasp...and the beautiful Annaleah who becomes his willing captive in order to find the key to his past and unlock their destinies.