The magical worlds of Greek demigods and Egyptian magicians are about to violently collide. Annabeth Chase is used to dealing with strange occurrences, but encountering a massive, two headed monster in the middle of a New York subway is odd even by her standards. During the chaos, she crosses paths with Sadie Kane, a fierce young magician from Brooklyn House who wields a deeply unfamiliar type of power. The demigod daughter of Athena and the rebellious Egyptian spellcaster must put aside their differences and team up to take down a massive, ancient foe. But as they fight to survive, they uncover a chilling reality: this power hungry god is not acting alone. He is being manipulated by a dark force that Sadie knows all too well. Dive into an explosive, fast paced crossover adventure where two of the most brilliant and dangerous heroes combine their skills to save the city from total mythological destruction.