No cost is too high when the world is at stake.Isaac is trying to live a normal life, but balancing baseball and high school with his Light Keeper training isn't working-and with the Eastern Passage opening soon, the pressure is mounting. Meanwhile, Yara crosses the veil to reconnect with her father, Prince Teris. As she searches for clues to help take on the High King, she uncovers dangerous secrets and begins to suspect their enemy is closer than anyone realizes.After the suspicious death of an ally, Isaac and Yara travel to Vietnam to unite with other Light Keepers and Guardians from around the world. But everything feels off-Yara's distant, the team's divided, and Isaac can't shake the sense that something terrible is coming. Is the mission doomed before it has even begun?If the Eastern Knight succeeds, faeries will storm into the human world. Even if Isaac manages to close the passage, the damage will already be done. Stopping him is the only way to protect the veil. Faced with impossible choices, alliances shatter and sacrifices must be made.Only one thing is certain: after this mission, no one will come back the same.