Claire, following the Lightwood family and Jace, ends up in Alicante, the capital of Idris, where the last weapon is kept—the Mirror of Death—over which Valentine is hunting. Only the one who holds this Mirror will gain peace.
In the fight against Valentine, the nephilim will unite with werewolves and other kinds of undead, and Claire will receive a new rune from the angel Ithuriel, but what it means, the girl will learn only after the decisive battle. All secrets and all riddles will be solved—but the most important question remains: what future is in store for Jace and Claire? Whoever turns the last page of the trilogy will find out.