Subliminal by Leonard Mlodinov
I saw Leonard Mlodinov speak at the Royal Society for Arts in 2012 and on the strength of this decided to buy his book. What this book essentially does is to summarise much of the science so far behind our understanding of the unconscious mind. And because he does not come from this field (weirdly, he is a theoretical physicist who incidentally co-wrote a book with Stephen Hawking and co-wrote Star Trek!) his style is very accessible and informative. I had a couple of moments when I wanted more source information but apart from that, this is a hugely interesting and good read.