Author: Iain M. Banks
Genre: Science Fiction
Series: Culture Book One
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The Culture is at war with Idrian Empire.
After a Culture ship is destroyed by the Idrian's, one of the Culture's Mind's escapes to Schar's World. The being's incorporating Schar's World will allow neither the Culture or the Idrian's on the planet. Bora Horza Gobuchul is a changer, a human who can change their body to impersonate anyone else, and changers were once stewards on Schar's World. Horza's hatred of the Culture finds him siding with Idrian's, and soon working with them to retrieve them missing Mind.
(Some spoilers in the review below).