Maddie, Josh, and the rest of the 911 dispatchers must work together to survive when the call center is taken hostage by a group of thugs dressed up as fake police officers.
Somewhere in Los Angeles, a gang made up of all men, except for their getaway driver Tiffany, have a plan they've been working on for some time. Using two LAPD patrol cruisers that they had acquired, the gang split up to hit two locations at the same time: An art museum, and the downtown 911 dispatch center. When the "officers" arrive at the dispatch center, Josh recognizes one of them from before, horrifying him, before they take him, Maddie, Sue, and the rest of the dispatchers hostage, also disabling the systems for a few minutes to avoid raising suspicion. Jake, the security guard at the front desk, is summoned up to the server room and knocked out. A gunshot rings out, and they assume Jake was murdered by the gunman subduing him to take over as the front desk guard.
Attempting to send LAPD and LAFD units to calls like normal, the crooks make it clear that no units are to be dispatched anywhere near the dispatch center or the museum, so when Athena arrives at a minor accident near the museum, the crooks send her to another call halfway across the city, only for Athena to see all the officers already there and suspect something is amiss.
Chimney and Buck also get suspicious after Maddie hung up abruptly after telling Chimney she loved him.
Meanwhile, Tiffany drops off a box that disables the security cameras at the museum, unknowingly triggering a silent alarm, but the crooks avoid sending any units there, unaware that the alarm was still recorded on the 911 call feed. With the cameras down, the other two crooks disguised as LAPD subdue the museum staff, imprisoned them in a storage room, and begin taking the artwork, doing their best to remove the GPS trackers before packing them up and loading them into the van. As far as the ringleader, Greg, was concerned, they thought they would have the job done within an hour, but when Tiffany reports that she needs another 30 minutes, he starts to lose patience in frustration and anger, due to how Tiffany was late picking him up by 3 minutes before launching the plan.
Meanwhile, unknown to the crooks, Josh secretly sends Athena to meet up with Chimney, and after they pull over and put Buck in the patrol car, they head to the dispatch center, unaware of walking right into a trap. As Athena is about to head up the elevator, the bald-headed, trigger-happy member of the gang, Foster, orders the phony security guard to shoot her, but thinking quickly, Sue instead sends Athena back out on another call, using the callsign "Code 77". Athena realizes after she rejoins Chimney and Buck that "Code 77" warns of an ambush, and Sue just saved her life from walking into a trap. Disabling her patrol car's GPS tracker, along with anything else the crooks could use to track her, and passing word onto her Captain and other members of the LAPD and LAFD, Athena regroups at their command post in preparation to storm the dispatch center to take it back with SWAT, but also notices that there was no response to the silent alarm at the museum.
At the museum, when they fear the plan has been compromised, the two thieves go to regroup with Tiffany, but find that she abandoned them, and Athena and LAPD are waiting, ordering them to surrender. However, the crooks are able to warn their buddies back at the dispatch center through their radios, and while the phony security guard tries to flee out the front doors, he is quickly lazed by SWAT and forced to surrender. Upstairs, when Maddie is about to be killed by Greg, another of the dispatchers fakes having an epileptic seizure, forcing Greg to release Maddie to get the dispatcher's Epipen. Maddie uses it to subdue Greg, allowing another to be taken down by Josh and the other staff, allowing them to acquire the crooks' TMP machine pistols, MP5K submachine guns, and regular semi-automatic pistols, which Sue uses to intimidate Foster into submission with the same threat he made to Josh earlier. Moments after, SWAT cuts the power and tosses in flashbangs as they prepare to storm the center. Foster panics, refusing to go back to prison, and freeing himself and grabbing a pistol, he tries to make an escape, but a SWAT member sees him, spots he's armed, and swiftly shoots him dead with a burst of AR-15 fire. Greg, who Maddie injected with the Epipen, goes into cardiac arrest, but Josh performs CPR, so when the medics arrive, Greg will live and is taken to the hospital, while the surviving crooks are also arrested. Relief dispatchers come in to take over and clear up the clutter of 911 calls left behind by the crooks taking over Dispatch while carrying out their heist.
In custody, none of the surviving crooks cooperate, citing their Fifth and Sixth Amendment rights, but the one hospitalized, Greg, agrees to a plea bargain and reveals that Tiffany was the real mastermind alongside being their getaway driver. As it turns out, Tiffany wanted Revenge on the gang for a previous heist that they got busted for, but her father, who was part of the gang at the time, was killed on, and Jake, the security guard from the dispatch center, was in on it as well, faking being shot and killed so he could sneak out undetected. Once he rejoined Tiffany, they stalled the plan another 30 minutes, then left the members at the museum high and dry as they drove off with what art they had acquired, and left the rest of the gang at the dispatch center to take the fall, leading to the death of Foster at the hands of SWAT, and apprehension of the rest.
Tiffany and Jake then attempted to flee Los Angeles via Amtrak or Metrolink with their stolen art, but thanks to Jake forgetting to take out the GPS in his cellphone, Athena and LAPD, including undercover officers disguised as train porters, either with LAPD or Amtrak PD, caught them on the platform and arrested them, recovering the stolen art. Tiffany may have been clever, but not clever enough to outsmart Los Angeles' Finest.
Tropes featured in the episode:
- The Dog Was the Mastermind: It's revealed that Tiffany, the supposedly meek driver of the gang of thieves, was actually the one who put the entire thing together, expertly covering her identity so the gang had no idea she was really the boss and working a secondary plan with her lover to let the gang to take the fall while they got away with the loot.
- Everyone Lives: Except the trigger-happy artillery member of the gang, Foster, who is swiftly shot dead by SWAT when he tries to pull a Screw This, I'm Outta Here and instead does a Suicide by Cop as he did not want to go back to prison.
- Ironic Echo: "Next one goes in your head." That's what Foster, the trigger-happy member of the gang says to Josh, and Sue then says to Foster later after disarming the rest of the gang of their weapons and catching him by surprise when he came back into the dispatch center.
- Near-Villain Victory: After letting the gang take the fall in Revenge for her father, Tiffany and her boyfriend believe they are soon on their way to safety with the stolen art from the museum. Unfortunately, Athena and the LAPD are waiting at the train station, some disguised as train porters, and make it clear Tiffany's little revenge plan was never going to get outside the LA City Limits.
- Spotting the Thread: The thieves' plan was to take the call center hostage and redirect any first responders to locations away from their heist. It doesn't take long for Athena to notice something's up when she gets a call to respond to a disturbance on the other side of town when she's already near one.
- Suicide by Cop: Foster, the Artillery member of the gang. Not wanting to go back to prison, he grabs a pistol, tries to flee, and when a SWAT member sees him, the SWAT officer swiftly shoots him dead before Foster can fire on him first.
- Villainous Breakdown: The various thieves start to panic, wrecking the Dispatch Center the longer their heist starts to unravel, with Foster deciding to commit Suicide by Cop so that he doesn't go back to prison.
