The Key (Guardians of Time)

The battle to protect the future is coming to an end as the evil Order of Chaos launches their final attack on the Named. To defeat the Order, the Named must locate the Key to a treasury of weapons hidden somewhere in the ancient city of Atlantis. The race is on to capture the Key before a horde of undead soldiers find it. And as the Named work against time, one of their own is plotting against them.

"Enormously imaginative." -VOYA