After years of waiting, New York's newest subway line is finally ready. Many dignitaries, including the American President, are in attendance for the inaugural run. When the train pulls into the station, they see that all the train cars are empty and the cars' interiors are drenched in blood. As chaos descends, all those in the pavilion scramble to get out. But the horror is only beginning. There's something living beneath New York City, and it's...

Former New York City mayor Tom Cafferty has been haunted by the horror of that single day: the opening of the brand-new Z train subway line beneath the Hudson River, the supposed shining pinnacle 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 hyperintelligent, bloodthirsty creatures previously unknown to humanity. Everything changed for Cafferty, ex-NYPD...

Jessie, a subway car "born" in St. Louis, Missouri, enjoys many years as an important part of the New York City subway system, and after she is replaced by more modern cars she begins another important job.

While preparing for her participation in the princepessa's wedding, adjusting to being a student at a school for the arts, and dealing with surprise visitors at home, twelve-year-old Olivia ventures into the New York City subway tunnels in search of a man who might help her friend Frannie.