''Matter'' is a 2008 novel of Literature/TheCulture, focusing on the various political goings-on on the Shellworld of Sursamen. The main protagonists are all siblings in the royal family of the Sarl on the Eighth level: Djan (now a Special Circumstances agent for the Culture), Ferbin and Oramen. The story begins in the midst of a war on Sursamen between the Sarl and the Deldeyn. The king of the Sarl, Hausk, is killed by his EvilChancellor Mertis tyl Loesp while Ferbin watches. Ferbin realises he has to flee and seek help from higher civilisations (termed Optimae by the Sarl) when he is pronounced dead, but he is pursued by tyl Loesp's knights while his younger brother Oramen has to deal with the pressure of being the only thing between tyl Loesp and the throne.
!!''Matter'' provides examples of the following tropes:

* ActionBomb: [[spoiler:Djan destroys the Iln war machine by detonating the antimatter that powers the implants in her skull]].
* ActionGirl: Djan Seriy Anaplian, as is to be expected from a Special Circumstances agent.
* BigDumbObject: Much of ''Matter'' is set on a Shellworld, which is an artificial planet consisting of multiple hollow concentric spheres. Each internal sphere consists of a different discrete planetary habitat. We are told that there are thousands of Shellworlds and that they were built by a long-vanished race for possibly nefarious purposes. [[spoiler:They also have a nasty habit of killing their inhabitants, though nobody has worked out what triggers them to do this.]] We also see a Nestworld, a vast [[http://en.wikipedia.org/wiki/Topopolis Topopolis]]-like structure surrounding a star built by a contemporary neighbouring race of the Culture; we are told just this one Nestworld is home to ''40 trillion'' beings, which is more than the entire Culture combined.
* BittersweetEnding: [[spoiler: All 3 siblings die due to the Iln Machine (although it's possible Djan could be brought back from back-up). But Sursamen is saved, and Holse returns to the Eighth level as Special Circumstances agent, along with the funds and means to improve life for the Sarl]].
* ContinuityNod: The [[Literature/{{Excession}} Sleeper Service]] is mentioned as being an example for supposedly-Eccentric ships all over the Culture.
%%* EvilChancellor: Mertis tyl Loesp.
%%* GiantSpaceFleaFromNowhere: The [[spoiler:Iln Shellworld-destroying machine.]]
* HumanAliens: The Sarl. They're pretty much human-basic, but due to the low gravity on Sursamen they are much taller than most pan-humans.
* ImportedAlienPhlebotinum: Discussed. Races at higher levels of technology (see below) are generally frowned upon if they give high technology to low-tech civilisations.
* MalignantPlotTumor: Most of the story is about tyl Loesp's rise to power, but halfway through [[spoiler:an Iln shellworld-destroying device is uncovered and takes over the plot as it tries to [[EarthShatteringKaboom blow up Sursamen]].]]
* MindProbe: The Sarcophogus in the Nameless City probes the mind of anyone who stands at a certain place in front of it.
* OutsideContextProblem: The [[spoiler:Iln war machine]].
** The actions of Djan in her introduction as an agent of the Culture make her one of these for a little while.
* SchizoTech: The Sarl have barely developed guns and their society is very much medieval, but they live on the eighth level of a Shellworld developed as part of a galaxy-spanning forcefield and are frequently contacted and assisted by the Oct, a civilisation with space travel and advanced technology.
* SealedEvilInACan: [[spoiler:The centrepiece of the Nameless City beneath the Hyeng-Zhar Falls turns out to be an Iln device developed to destroy Shellworlds. Although depending on what the Shellworld's original purpose was (either a galactic shield or a prison cage), it could potentially be a very misguided WellIntentionedExtremist]].
* ShutUpHannibal: [[spoiler:When the Iln war machine tries to explain its actions, Djel mutes it]].
* SpaceWhale: The Xinthian [=WorldGod=] is one.
* StrangeSyntaxSpeaker: The Oct apparently think "laterally". Unfortunately, they're incapable of anything but lateral expression, rendering them incomprehensible to other species who aren't concentrating hard (preferably after writing it down first).
* TechnologyLevels: The Sarl are right at the bottom in this book, with many levels of civilisations above them in technology and power. The Oct and Aultridia control transit between Sursamen's levels, but they're insignificant on a larger scale. The Neriscene control the Surface and therefore the whole planet, and have a significant empire, but the Morthanveld are truly in control of the whole region of space and have technology rivalling the Culture. Holse is disheartened by the seeming insignificance of his people in the galaxy, but he soon realises that only the rules on his own level matter to him.
** Played with when Ferbin and Holse try to access how dangerous the Iln Machine is. Both wonder why it's capable of doing so much damage when the Culture and Morthanveld are of a seemingly equal technological level. Djan explains that different civilizations develop at different levels, leading them to different technological outcomes; there isn't a universal technology tree that every Involved civilization will achieve.
* UpperClassTwit: Ferbin, although he is a relatively benign example, simply being not very intelligent but not at all malevolent. Although to be fair, the circumstances he's in are WAY beyond anything he's practically capable of dealing with.