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The Hydrogen Sonata
Author Iain M. Banks
Publisher Orbit Books
Publication Date 4 October 2012 (UK)
9 October 2012 (USA)
Page Count 528
ISBN 978-0356501505
The Hydrogen Sonata is Iain M. Banks' ninth novel in the Culture series, and, due to his passing, also the last.


The Hydrogen Sonata is about the Gzilt, a civilisation that almost joined the Culture 10,000 years before the novel, that have decided to Sublime, leaving behind “the Real” to take up residence in higher dimensions. The Zihdren-Remnant, what is left of an older species that Sublimed before the Culture was formed, send an envoy to confess a long-kept secret before the Gzilt depart but a Gzilt warship intercepts and destroys their ship several weeks before the Sublimation is due to take place in order to preserve that secret.

The story follows a group of Culture Minds that are trying to find out the secret and what to do after they find it. The search centers around a truly ancient Culture citizen (Ngaroe QiRia) who is supposed to have taken part in the setup of the Culture some 10.000 years ago.

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