In a near-future world drowned by rising oceans, Denver survives as one of the last tightly controlled safe zones on the planet where every resource is rationed and every citizen is monitored. Max Flynn, a veteran border officer struggling to protect his family under these unforgiving rules, is shattered when his wife is suddenly kidnapped. A mysterious enemy forces him to betray Denver from within or lose her forever. As Max assembles a trusted crew and descends into the city's underbelly, his desperate hunt threatens to expose the cracks in Denver's rigid order and ignite a reckoning that could end the last safe city on Earth.
