Book: Consciousness: A Very Short Introduction, Susan Blackmore.

Despite the title, I found this book to be a pretty in depth introduction to the, quite wide and possibly intangible, topic of consciousness. Blackmore does a fantastic job of keeping the reader interested, and before you know it you're exploring some pretty complex concepts. On my way I read about dualism, religion, philosophy and other things which made it clear that the more you look into consciousness and what it is, the more it presents itself as.

It's also worth mentioning the actual physical size of the book too - it looks more like a handy tourist guide than anything else. And there's a whole range of Very Short Introductions from OUP from Theology to Kafka, and if they're anything like this one they'll be well worth reading too. More at http://www.oup.co.uk/general/vsi/.