2312

by Kim Stanley Robinson

The novel is set in the year 2312, in the great city of Terminator on Mercury, which is built on gigantic tracks in order to constantly stay in the planet's habitable zone near the terminator. Swan Er Hong, an artist and former asteroid terrarium designer, is grieving over the sudden death of her step-grandmother, Alex, who was very influential among the inhabitants of Terminator. After the funeral procession, a conference is held among the family and the close friends of Alex (some of whom Swan has never heard of, including Fitz Wahram, a native of the moon Titan, whom Swan dislikes). Following the conference, Swan decides to head out to Io to visit another friend of Alex's, called Wang, who has designed one of the largest qubes, or quantum computers. While Swan is visiting Wang on Io, an apparent attack of some sort fails. An attack on Terminator shortly follows; a meteorite of artificial origin destroys the city's tracks, stopping the city and exposing it to sun, essentially cooking it. As Swan travels, she learns more of the mystery surrounding her grandmother's death and the destruction of her home-city of Terminator. With Wahram and Genette, Swan travels throughout the solar system and investigates an escalating series of conspiracies.

Inspector Genette eventually discovers how the artificial meteorite that destroyed Terminator was created: someone launched a large number of smaller objects on trajectories that would eventually cause them to coalesce above Mercury, but low enough that the planet's defense system could not destroy the now large object in time. The complexity of the attack leads her to determine that quantum computers must have been used.

Meanwhile, Swan and Wahram become involved in restoring and re-wilding the climate-change-ravaged Earth by returning thousands of species from space-based temporary environments to their home environments on the Earth.