My coverage of Iain M. Banks' wonderful Culture series continues with the seventh novel, Matter, published in 2008. This is the longest Culture novel yet, and in some ways the most complex - set on a vast macrostructure, specifically the artificial planet of Sursamen. Banks weaves an ambitious plot which at times makes the novel feel like Use of Weapons nested inside Inversions - or perhaps it is the other way around. This is literally a story of spheres within spheres, as the different levels of the planet play host to various species, conflicts, and levels of technological development.

In what is in part another Banksian meditation on the ethics of intervention, a novice Culture agent must decide how best to interfere in a conflict that threatens not only her siblings, but the fate of a world.

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