The Ghost of the Cazador (Dark Hunters Book 1)

He considered himself the last of his generation. A man still alive because he had settled all his scores, outsmarted and then buried all his enemies, a lover of details and a dedicated practitioner in a world of amateurs.
A random event forces him to spend the night at the tiny Galite Islands waiting for a ship to carry him back to France, when the appearance of a strange secretive man, brings back memories of a very old enemy and compels him to act.

this story is set in the same universe as the Living Sword Chronicles.