Books in the Eternal Nights series

It's been over ten years since their near fatal war with the Sword of God, and John and Danielle have established themselves in a new haven. Life has finally returned to normal for our couple and their dysfunctional family of ghouls, a priest, and their first vampire childe. They want nothing more than to be left alone, when the summons from an ancient being on the other side of the world forces them into action. Searching for answers, they battle an enemy they could never have foreseen. As powerful as their foe appears, is he even the true enemy our couple must face?As they are torn apart to face a darkness that shouldn't exist, that can't exist, will the knowledge of their origins come at the price of their own destruction?