Humanity is on the move. A sphere of Verity Space is consuming the Earth at an inexorable creep. A single city resists, slowing the advance in a seemingly hopeless war of attrition. Refugees pour into the Yakini's caravan of misfit buildings as Jose, Nomia and their band of Nodes wrestle against inevitable destruction. Bergur & Sera travel to a Mars seeking fresh supplies of a bio-weapon inexplicably effective against the Eidolons. Reeling after their own brush with annihilation, the Martians are more interested in internal squabbles than in helping their former overlords on Earth. Mex and Julienne, drawn together by their differences, are wrestling to share a single mind, even as they battle to thwart the death throes of a corporate paradigm. All the characters of the Verity Trilogy come together in Certitude; humanity's ultimate struggle against erasure from reality.

Some will flourish, while others will make the ultimate sacrifice.