The highly anticipated third book in the New York Times bestselling Supernatural Investigations series that began with Amari and the Night Brothers! Perfect for fans of Tristan Strong Punches a Hole in the Sky, Percy Jackson and the Olympians, and Nevermoor. War has come to the supernatural world, and Amari s two worst enemies are leading the charge. Elaine Harlowe continues to control the Bureau of Supernatural Affairs from the shadows, springing reckless traps for magicians that use ordinary citizens as bait. Meanwhile, Dylan Van Helsing, the newly crowned leader of the League of Magicians and Amari s former partner is after a destructive new power that would not only ensure the magicians victory.it would make him invincible. With neither the Bureau nor the League safe for Amari, and her newly returned brother, Quinton, determined to keep her out of the fray, she and her friends decide to find a way to end the war on their own. So, when they learn that the only way to stop Dylan is with an ancient weapon known as the Nameless Knife, they go after it. But wielding the knife comes at a terrible cost, and Amari will have to decide just how much she is willing to sacrifice because the blade will demand everything.