On Easter Sunday morning, the city of Boston is struck by a widespread and coordinated series of terrorist attacks: an explosion in the T, a suicide bomber at Back Bay Police Station, and heavily armed gunmen taking hostages at the Patriot Hotel. For robotics innovator Louis Massina, aka the Puppet Master, this is far more personal than a savage act of political terrorism. Boston is his city - and one of his employees, Chelsea Goodman, is among the hostages facing certain death. As Chelsea fights from the inside, Massina leads his team of tech geniuses at Smart Metal to deploy every bot, drone, and cyber weapon at their disposal to defeat the fanatics and save his city and friend.