Armentrout, Jennifer L. Harbinger

Sequel to: Rage and ruin

In this thrilling conclusion to the Harbinger trilogy, Trinity, who is out of options, brings Lucifer back to the world to fight the Harbinger, a decision that carries disastrous consequences with it

Even with both demons and Wardens on her side, Trinity Morrow may not win the war against the Harbinger. Bringing Lucifer back to the world to fight the Harbinger is probably a really, really bad idea, but the world's ultimate fallen angel is the only being powerful enough to impact the outcome. As Trin and Zayne form a new and more dangerous bond and Lucifer unleashes Hell on earth, the apocalypse looms. Win or lose, one thing is certain: nothing will ever be the same. -- adapted from jacket