In 2016, ctOS 2.0, an advanced operating system networking city infrastructure, was implemented in several US cities to create a safer, more efficient metropolis. Play as Marcus Holloway, a brilliant young hacker living in the birthplace of the tech revolution, the San Francisco Bay Area. Team up with DedSec, a notorious group of hackers, and expose the hidden dangers of ctOS 2.0, which, in the hands of corrupt corporations, is being wrongfully used to monitor and manipulate citizens on a massive scale.