The end is here for Devi Lawson… Devi may have killed the arch-demon Lythocrax, but in the process, something much worse has been unleashed. The Divine Agents, rogue angels, have given Devi an ultimatum: join them, or watch earth crumble to ashes. Preparing for war would be difficult enough without the nether realms getting involved, but two demonic overlords would like a piece of Devi, too. Meanwhile, her warlock partner Nikolas fights a battle of his own, for leadership over earth's warlocks. And in the background, an old enemy might not be as dead as Devi thinks. The celestials want her as their saviour. The demons want her dead. The rebel angels want the worlds to burn. And to save the ones she loves, Devi must make an impossible choice… Celestial Storm is the final book in the Celestial Marked series.