Sad that this was Iain Banks' last novel. I have enjoyed most of his 'straight' novels (tried one of the SF stories but it was not to my taste) but this one I found had an extremely thin plot and most of the characters seemed indistinguishable and rather unpleasant. Putting the central character, Kit, on the autistic scale added interest to his internal dialogue but had no perceptible impact on the outcome of events. The sub plot of the relationship between Kit and Holly was more interesting than the main thrust - the search for the tape.
I'm with the comments of the reviewers who have awarded one and two stars except that there are some really awful books out there. This isn't that bad so I'll give it three.