The St. Perfidious Yearling Academy is more than what it seems. To the world, it may look like a fancy boarding school, but to its students St. Perfidious is known by a different name -- Spy Academy. Titus Coin is about to become the richest kid in the world. He's inheriting the fortune of his late grandfather, including a priceless gemstone, the Blue Carbuncle. To celebrate, Titus is throwing a fancy black-tie party for kids only. But the Blue Carbuncle has a secret, and the Spy Academy needs to find out what that is. Which is where Marcos comes in. He and his team must infiltrate Titus's party to investigate the gem -- and keep it out of the hands of the ROGUE School!