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Nashville is under siege, with each missed ransom escalating the stakes. As the city descends into chaos, Don grows desperate after losing contact with Blythe and races to find her before it's too late.
As Don, Blue and Ryan take extreme measures to prevent a distillery explosion, the 9-1-1 call center is disrupted by budget cuts and hackers. Blythe faces an emergency of her own.
Time is running out as ransom demands and medical emergencies escalate. A power outage triggered by hackers wreaks havoc at the hospital.