The Sea Devil. Pirates of Britannia: Lords of the Sea, #3

Thornley "Thor" MacLeod, Captain of The Sea Devil and prominent member of the Devils of the Deep is out for one thing and one thing only--revenge against Santiago Fernandez, leader of Los Demonios de Mar. Tormented by the demons of his past, he knows the only relief to his pain will be spilling the blood of his enemy. When he learns that Santiago seeks to find a child he abandoned nearly two decades before, Thor is determined to find the precious treasure first.
Which means, Thor may have to sacrifice his honor in order to exact the perfect vengeance.  Orphaned at a young age, Alesia Baird has grown up along the harsh coasts of Scotland, bearing witness to many a nightmare. With the hangman's noose dangling ever closer to her neck, she has to find a way to escape the only life she's ever known. When she overhears a pirate mention he seeks the child of Santiago Fernandez, Alesia takes the leap, knowing this could be her only way out. Alesia must keep up the ruse long enough to escape with her life, and perhaps a sack full of jewels.
But when it comes time to jump ship, she finds her destiny may have led her in a different path. Will the hardened Highlander allow a lass into his heart-or is she destined to be forever alone?