Lilith Hatathli is a rock climbing, mathlete, badass on her way to college with her best friend, Paul. Then a demon possesses all 400 people at prom, which throws a wrench into her planned life trajectory. Kata Harca is handmaiden to another immortal—a true historical figure and the world’s most prolific female serial killer—Elizabeth Bathory. Elizabeth has made a deal with the Bible’s most powerful demon, and when Kata Harca finds out, the two girls’ lives are driven headlong toward each other to a most dramatic conclusion in the heart of a glacier in Antarctica. Only with each other’s gifts, Lilith’s special voice and Kata Harca’s extraordinary touch, can they beat a horde of demonic man-sized spiders and harness the power of forgiveness to save the universe.