Sentinel (Covenant, 5)

"He was my strength when I needed him to be, my friend when I needed someone to talk me down, my equal in a world where by law I would always be less than him, and honest to gods, he was the love of my life."
The gods have decided to battle the God Killer, and they don't care who dies in the process. Now, Alex must overcome a crushing defeat that has left her shaken and doubting her ability to end the war that has demolished almost everyone she holds dear.
At least she still has Aiden. Though there are so many obstacles between their happily-ever-after that she can't seem to find a way to move past her pain. It consumes her, but she has no choice but to keep fighting. Their lives on the line and no other hope for survival, Alex and her friends must trust a deadly foe as they travel deep into the Underworld to release one of the most dangerous gods of all time.