Seven Degrees Stronger (book 2 in Cole's series)
While Cole wrestles with his control and temptations, Tenna’s fears and apprehensions about finding her sister mounts. But with new threats on the rise and a secret exposed, she may not have much choice in the matter. And as Cole grows dangerously linked in his tie to the immense power in the cave, there is only one solution. And he’s not exactly thrilled about it.