Since the beginning of time, the Sun has been fading, and the light that shines on the earth is dimming, causing the elements to be more volatile and impossible for the keepers to control. Now they must enlist the help of one man, Finn, to help them bring the light back to the Sun. The keepers war, the North Star steals light from the Sun, and the Moon is in disrepute. The end of existence is coming, and all the while the king, the Moon, Lir, remains silent.
An earthquake caused by Wren and Satchel's ill-fated tryst brings forth a prophecy that sends the Unrest and the Delegation into a tailspin. Immortals on the Earth must be abducted and hidden from the North Star's greedy grasp. Vespera's fury erupts as the Unrest begins to splinter off from the Moon behind her back. Attacks that should be used on the enemy target her supposed allies. Seeds of doubt, betrayal and rebellion begin to sprout in the Realm of the Sun and the Moon, causing division, subterfuge, and deadly attacks.
Light is being stolen, immortals are waking, wombats are untrustworthy and a dead body is rising. After a long time of wishing they could jump into the battle, the Unrest finally has their day in the Sun. Unfortunately, that day is filled with certain death. Ash comes into his own and joins his parents to fight Vespera and Red Flame. Henry reunites with his own people, only to find that the lair will never be the same again.