by Ian Rankin.
Quickie recap: Detectives Rebus and Clarke are sent to a private school where a gunman has just shot several students before turning the gun on himself. The case seems pretty open and shut, except for the motive...but of course, if it was, it wouldn't be much of a book.
Quickie review: I've never read Rankin before despite him being "one of Britain's leading novelists in any genre" according to the cover, which is probably pretty biased. It was decent. Not great, but okay. I was able to make it all the way to the end, and that's more than I thought I would be able to say.
Quickie recommendation: Meh.