This is probably the obvious post ever made by a graphic designer but 'the wasp factory' by Ian Banks is a must read, I'd give a miss to 'Walking on Glass' by the same guy though, it was a bit of a mind mash and i didn't like it at all. Not to say you won't! you might enjoy it!
Oh and EVERYONE should read 'The curious incident of a dog in the night-time'
Thats all! Hope some of you have already enjoyed these treats