We like to think that we are in control of our lives, of what we do, think and feel. But, as Geoff Watts discovers, scientists are now revealing that this is just an illusion. A simple magic trick reveals just how limited our conscious awareness of the world is, and how easy it is to fool us. So if our conscious brain can cope with so little, what is responsible for the rest? Science is starting to reveal the crucial role of a silent partner inside our heads, that we are completely unaware of - our unconscious. In this programme, Geoff enlists the help of not just brain scientists, but a conjuror and a musician to reveal the pivotal role the unconscious plays in pretty much everything we do, think and feel. This new-found knowledge is enabling scientists to harness its powers for both medical and military benefit.