Everett Singh has escaped with the Infundibulum from the clutches of Charlotte Villiers and the Order, but at a terrible price. His father is missing, banished to one of the billions of parallel universes of the Panoply of All World, and Everett and the crew of the airship Everness have taken a wild, random Heisenberg Jump to a random parallel plane. Everett is smart and resourceful, and, from a frozen earth far beyond the Plenitude, he plans to rescue his family. But the villainous Charlotte Villiers is one step ahead of him.
The action traverses the frozen wastes of iceball earth; to Earth 4 (like ours, except that the alien Thryn Sentiency occupied the moon in 1964); to the dead London of the forbidden plane of Earth 1, where the emnants of humanity battle a terrifying nanotechnology run wild—and Everett faces terrible choices of morality and power. But Everett has the love and support of Sen, Captain Anastasia Sixsmyth, and the rest of the crew of Everness—as he learns that the deadliest enemy isn't the Order or the world-devouring nanotech Nahn—it's yourself.