The Reversion plucks Samuel from a dying world and drops him into another, a decaying desert wasteland of darkness and peril. As his memories return, Samuel finds himself in another cycle of destruction, and he leads newcomers Jack and Lindsay towards redemption in the mountain stronghold of the mysterious one known as Deva. Finally, as the locality collapses behind him, Samuel realizes his only escape from the Reversion will be putting his faith in The Law of Three.