Their long journey to the City of Falling Water is over, but what they find is nothing like the rumors. Nitcef races to find his little brother without being found himself, by a fiancée whose mind now belongs to the enemy. Meanwhile, Sarsa is forced to make an impossible choice, pitting her hopes for salvation against her. Novarro, already thought to be lost at sea, is saved from death by a Redemptionist and a winged mongrel named Sivy — the very assassin who caused Verian’s sudden rise to power.

At the heart of the city, one man who calls himself "the Historian" — whose prophecies culminate in the rapid conquest of the Earth — awaits the power that only comes when mankind is united under one language and one king, the power to speak his own godhood into being and remake the world. He does not know the God whose speech had first created mankind, and who is still acting to save it.

In the final book of This Falling Eden, the place where the travelers’ mission fails is the point where God’s mission succeeds, where the redemption of one cursed man destroys so much of death’s power. When speech, memory, and history unite at one tower, at a future the ancestors had failed to enter — where sin and death will be under his immortal command — the Historian finds that future tearing away from him, collapsing into the same void that all of mankind’s sin is destined for.

And, perhaps, all of mankind’s memories too.