After tech billionaire Gideon Reeves witnesses his best friend's murder, he takes charge of Chicago's troubled 13th District and reboots it as a technically innovative police force, challenging the district to rethink everything about the way they fight crime. Gideon knows if he's going to change anything, he'll need help, which he finds from detective Theresa Murphy, an ambitious, street-smart cop who is willing to give Gideon's technological ideas a chance. After Gideon launches the APB app, allowing citizens to immediately alert the police of a crime, downloads of the app spike, and Gideon realizes his work is just beginning.