The Tomb of Shadows (Vol. 3 The Seven Wonders)

Jack McKinley and his friends have defeated the Colossus of Rhodes, found ancient treasures in the Hanging Gardens of Babylon, and recovered two of the seven lost magical orbs, only to discover they've been betrayed by someone very close to them. With Babylon in ruins, Marco on the enemy's side, and ancient secrets revealed, the Chosen don't know who to trust or where to turn. Their powers are growing at an alarming rate, their world is turned upside down, and their enemies are hot on their trail. But Jack, Aly, and Cass have no choice but to keep fighting. With the fate of the world hanging in the balance, the friends find their next stop on their journey: the Mausoleum at Halicarnassus, where they will face their own demons and wage an epic battle with the shades of the dead. But when promises are broken and blood is spilled, the Chosen will be forced to destroy the only thing that could save them.