Chasm City
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Chasm City is a 2001 science fiction book by author Alastair Reynolds, set in the Revelation Space universe.
Chasm City is framed and largely written in the voice of Tanner Mirabel, a security expert who has come to Chasm City to avenge the death of his former client's wife at the hands of a "postmortal" noble named Argent Reivich.
Tanner arrives to find that Yellowstone, the most advanced civilisation in human history, has descended into squalor; an alien nanotech virus known as the Melding Plague has wreaked havoc throughout the system. Chasm City, a dense forest of mile-high shapeshifting skyscrapers, has melted into a slum. The Glitter Band, a sparkling diorama of ten thousand orbital habitats, has been reduced to a Rust Belt of a few hundred survivors, mostly primitive and pre-nanotech antiques.
In this chaos of plague and desolation, Tanner seeks his prey, only to discover that Reivich's motives are more complex than he originally thought. In the midst of his hunt, he begins experiencing virus-induced flashbacks from the life of Sky Haussman, the founder of his homeworld, Sky's Edge, who is both revered and reviled for the crimes he committed for his people.
From the depths of the gas plume at the heart of Chasm City, to the aristocratic canopy spanning what remains of the skyscrapers, Mirabel begins to unravel the mystery of the Melding Plague.
