Lyra faces a deadly threat when a mysterious figure forces her to hold a gun on herself, threatening to kill her ally Jace in two minutes unless she complies. Jace has just been ambushed at the Seventh Line, and Lyra manages to save him despite his critical condition. She warns that if she shows any weakness, the dark energy infecting Jace will finish what the attackers started. Racing against time, Lyra attempts to carry the injured Jace to the safety of Sector Seven’s underground bunker, but their escape is complicated when an automated system locks onto her and activates a purge protocol.