In the aftermath of his close friend's murder, the tech billionaire Gideon Reeves decides to take charge of the worn-out Chicago Police 13th District, as he equips it with his high-tech gadgets and makes it up-to-date with the latest technology.
Gideon tags along with the newly promoted detective Theresa Murphy, as they go after a thief who robbed a pharmacy. Gideon gives the police force's motorcycles an upgrade in order to go faster. The mayor assigns a task force to thwart Gideon's plans for the 13th District.
Before he was killed by jewelry thieves, a security guard used the APB app, whereupon Gideon modifies a feedback chair in the interrogation room that will help find out the truth after a suspect is arrested.
Gideon comes up with a smart fabric jacket that becomes a transmitter in order to help Brandt with his undercover work to catch an illegal weapons dealer. Murphy's ex-husband Scott attempts to dig up dirt on Gideon to take him down.
In order to avenge his daughter who was harmed by using a dangerous synthetic drug, a desperate man tries to enlist Gideon's help to take down the people who are responsible. But things take a drastic turn, when the man goes to extreme measures to bring justice to his daughter.
After getting mixed-up with a gangster, Gideon's father Joe asks for his son's help in exchange for aiding them at the 13th District in catching the crime family. Brandt and Goss are going after a cunning teenage auto thief.
When he attends a tech summit, it's revealed that Gideon's life is in danger, as a hacker is targeting him to gain access to the summit. As Brandt and Goss attempt to prevent a young man from committing suicide, they end up revealing their secrets.
As Gideon and Murphy attempt to uncover the mystery behind a series of arson attacks, they realize that their initial thought of them being gang related is far from the truth. Gideon is worried about his meeting with the company's shareholders.
After an FBI informant is presumed dead while working undercover within a drug cartel, Gideon uses one of his expensive gadgets to track him down. Gideon faces backlash from the board of directors because of his overspending on the 13th Precinct.
When a serial rapist starts to terrorize the neighborhood, Murphy and Gideon are forced to turn to a drug dealer to give them any leads that could help them catch the rapist. Ada struggles to save the 13th Precinct from the evil plots of the hacker, Danny (DV8).
As DV8 attacks the 13th, Captain Conrad sends Gideon to his penthouse after his life becomes in danger. Gideon and Murphy look for a way out after being ambushed by DV8's men.
In an attempt to save face, the mayor uses Gideon as a scapegoat following the recent terrorist attacks. As DV8 dares the 13th to catch him, Gideon and Murphy try their best to save the mayor after DV8 sets his sights on city hall as his next target.