In A Glance (The Sword of Glastonbury #9)
Lisa Shea

Hugh had returned from the Crusades with a mission - to lend assistance those who were weak and vulnerable. When an unknown woman had the potential to interfere with a critical assignment, at first he strove against the interference. It took him completely by surprise to realize she was the woman he had longed for, that summer's afternoon long ago in the Holy Land. The woman who now haunted his dreams.
Joan and Hugh quickly discover that the kidnappings and local violence they are investigating go far deeper than they ever could have imagined. Soon the threat broils into a massive thundercloud, roiling, rumbling, threatening all they hold dear.