The Underworld Series: Rise of the Queen by RJ Kane

Picking up exactly where the previous volume left off, Volume 4 continues to shine a light on the darkest places within each character. More information is learned, abilities continue to grow and evolve, and the likelihood they'll have to save the world increases exponentially. Familial relationships strengthen, even with the addition of new players onto the chess board, all while keeping the entertainment factor as high as possible.