Why can your foot move halfway to the brake pedal before you're consciously aware of danger? Why do you notice when your name is mentioned in a conversation that you didn't think you were listening to? Why are people whose name begins with J more likely to marry other people whose name begins with J? Why is it so difficult to keep a secret? Renowned neuroscientist David Eagleman navigates the depths of the subconscious brain to illuminate these surprising mysteries, taking in brain damage, drugs, beauty, infidelity, synesthesia, criminal law, artificial intelligence and visual illusions.