The Sultan's Stone. The Veritas Codex Series, #8

Lauren Grayson stands up against the greatest evil she has ever encountered. An evil from her own past. Life after The Veritas Codex was supposed to be simple. Lauren Grayson and her family have built a quiet new life in Denver-until her husband Rowan stops a convenience store robber and uncovers a terrifying link to a cache of stolen, otherworldly artifacts. His search for answers draws the attention of Enlil, the ancient god who loathes Lauren for standing in the way of his dark ambitions and knows the surest way to break her is through the man she loves.
Their investigation leads them to the haunted Stanley Hotel, where Lauren is forced to confront a fear that has shadowed her for more than twenty years. The missing relics aren't just dangerous-they're pieces in a deadly game Enlil intends to use to tip the balance of good and evil and reclaim dominion over the world. Hungry for revenge, Enlil exploits Lauren's love for Rowan, using it to seize half of her soul.
With part of her spirit already in his grasp, he frees his loyal servant Papa Dauphine from prison and unleashes him on her family. To protect the people she loves, Lauren must make an impossible choice: surrender what remains of her soul... or let darkness claim everything. How can a woman with half a soul stand against a god?"So Stephen King." Maria Park, Goodreads