Usurpation, the third book in the series that began with Semiosis, is more of a companion novel than a continuation of the original story.
Immunity Index takes place in a future that is uncannily similar to 2020. A pandemic spreads across the world, killing thousands and breeding political dissention.
“Like Semiosis, this novel is a rich and engaging exploration of different forms of intelligent life and how they might think and act.”
