The final day will be a day of ice, not fire.

When her ex-boyfriend goes missing, Luna will stop at nothing to find him—even if it means teaming with the Shadow Warrior she vowed never to see again.

Desperate to know the truth, the reluctant companions uncover a scheme that threatens not just the life of the ex-boyfriend, but promises to unleash Horror, a being so cataclysmic that life on Earth as we know it hangs in the balance.