Former NYC Mayor Tom Cafferty has been haunted by the horror of a single day. The opening of the brand new Z-train subway line beneath the Hudson River--the supposed shining moment of his tenure. But the ribbon-cutting ceremony turned deadly when the train carrying Cafferty's wife and other citizens was attacked by a horde of hyper intelligent, bloodthirsty creatures previously unknown to humanity. Everything changed for Cafferty, ex-NYPD officer Sarah Bowcut, and tech-expert Diego Munoz that day. They had uncovered the deadly truth: the attack was no accident. And now the creatures that wreaked havoc underneath New York have spread worldwide, and with a massive cover-up--and a secret organization holding nations hostage with the knowledge of how to kill them--Cafferty's team must fight against impossible odds to save the entire planet from an apocalyptic scale disaster.