What does it truly mean to be a thinking being? What if you could sleepwalk through life: faster, smarter, and more creative than you could ever be consciously? Could you face who you truly are? Vincent Thorndike is a former human test subject who is forced to face these questions. He shares his mind with his augmented sub-consciousness: the Sleepwalker. Together, they wage a one-man campaign of industrial espionage against the corrupt government and ruthless corporations of New Columbia. However, Vincent begins to find other survivors of similar experiments, prototypes for a larger project. Together, they are drawn into a sinister plan to forever alter the human mind.