A good, solid Banks book - not one of his classics, perhaps, but a superbly paced thriller that handles both the different skeins of narration and the twists and turns of plot deftly. The novel is a contemplation of solipsism, and of the responsibilities and insulations of power, with a lovely mirror held up to the War on Terror and a quick diversion into financial ethics. 
 For me, all Banks' great books fall into his SF works, and in some ways this "cross-over" allows him to flex some of those same allegorical muscles here (although he has done so before, with the Bridge and Walking on Glass), and this is definitely in the high end of his non-M books.