The Adventurer

Shrouded in myth and mystery, an ancient crystal falls into the hands of beautiful Isabella Drayton. But when she tries to return the fabled stone to its rightful owner, Isabella, in turn, falls into the brawny arms of the darkest, fiercest member of the MacKay clan.

He is none other than Calum MacKay, the legendary Adventurer, notorious raider of British prison ships. But beneath his wild hair and smoldering gaze burns a passion that is bound by the forces of fate itself. For Isabella has captured his heart with her beauty, her spirit, her love. And he has become the prisoner....

This is #2 in Highlander Heroes Trilogy.