The Peregrines are in search of the last piece of armor known as the Sword of the Spirit. Rumor has it that the swords were all melted down and destroyed long ago. Without knowing where or when, they can't go back into time to prevent it so they must figure out another way.
Seth, and Caroline find themselves separated once again. The Final Twelve must split into teams to take on four different beasts to do battle for the fate
of the world. All the realms, unknowingly, are depending upon the Peregrines, Dragoman, and the ever-important Beast Keepers to fulfill the prophecy revealed to them in the Book of the Keepers.
The swords have been refashioned by the blacksmith who was appointed by God to forge them once more for the battle to end all battles. If they can succeed, the new world will live in peace forever and they can finally be at rest to live normal lives as rulers over all the lands and realms of the earth.