Dark Skye by Kresley Cole

Lanthe and Thronos were children when they met and were convinced that they would be in love forever. And they were, until Thronos betrayed Lanthe's parents. Since then, his family has been torturing hers. And he just won't let her be. Even to the point of following her onto an island of torture. When they are (somewhat) freed, he immediately captures her. 

But their time together means that past lies and misunderstandings might finally come to light. It took a little bit longer than I really would have enjoyed but this is overall a nice addition to the series. 

Four stars

This book came out 

Follows MacRieve

Followed by Sweet Ruin

Hard copy of mine

Opinions are my own