Consider Phlebas

I've been dragging my heels about writing up this book ever since I finished reading it nearly a month ago, because I've got no idea what to say about it. Consider Phlebas is the story of a Changer called Horza. Changers can alter their physiology to make themselves into a mimic of a person, and so make good spies or military agents. Horza is a minor figure in a vast war between the Indirans and the Culture. The war is about expansion and politics and beliefs, of course, but Horza's part in it is down to a simple principle. The Indirans are all biological, but the Culture have machine AIs who are not just citizens of the Culture but heavily involved in running the Culture. And Horza feels that is wrong, on a deep fundamental level. He (and in fact his entire world/people) are on the Indiran side, despite the fact that the immortal Indirans regard mortals as not really people. At least they're all biological, right?

Horza is rescued from near death after a mission goes wrong, and sent to capture a Mind (a Culture AI) which has gone to ground on a Planet of the Dead. A Planet of the Dead is sort of a museum exhibit - a particular civilisation preserve worlds where the sentient species self-destructed, and embargo them. Except that a few guardians are permitted, and for this particular Planet of the Dead those guardians are Changers, and Horza was once amongst their number. So he's a good choice, but obviously things don't go smoothly (there'd be no story otherwise). Horza ends up "rescued" by a mercenary ship after a space battle destroys the Indiran ship he was on, and must first ingratiate himself and then wait for his chance to fulfill his mission. As a supporting cast we have the various other mercenaries, and for a primary face of his antagonist we have the Special Circumstances agent Balveda who is trying to get to the Mind first (to rescue it).

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