Undercover GRE agent Kyle Crane is airdropped into Harran to retrieve a sensitive file stolen by Kadir Suleiman, who is using it for blackmail. Crane is bitten by an infected, though he is rescued by Jade Aldemir and taken to a survivor sanctuary inside a skyscraper called the Tower. Crane is introduced to Rahim Aldemir, Jade's younger brother, who then teaches him the basics of parkour. Crane learns that the Tower is being harassed by a gang of bandits led by a warlord named Rais who steals and hoards supplies from the GRE airdrops. This includes Antizin, a drug that slows the process of infection and suppresses its symptoms. Crane is tasked with reaching an airdrop containing the direly needed Antizin but the GRE instructs him to destroy the airdrop and instead buy the drug from Rais in order to confirm his identity. Crane reluctantly complies and lies to the Tower that the supplies have been looted.
