The Tomb of Shadows (Seven Wonders)

Jack McKinley and his friends defeated the Colossus of Rhodes, and recovered two of the seven lost Loculi; only to find that they'd been betrayed by one of their own. With Babylon in ruins, Marco on the Massarym side, and long-held secrets coming unraveled, the kids don't know who to trust. Their G7W powers are manifesting at a furious pace. They have no choice but to continue their quest, to the most terrifying of all the Wonders.