After years of planning and construction, New York unveils its newest subway line, an express train that connects the city with the burgeoning communities across the Hudson River. Major dignitaries, including New York City’s mayor and the president of the United States, are in attendance at the breathtaking Visitors’ Pavilion beneath the river for the inaugural run as the first train slowly pulls up to the Pavilion’s platform.

Under the station’s bright ceiling lights, the shiny silver cars gleam. But as the train comes closer, a far different vision of the future rolls into the station. All the train’s cars are empty. All the cars’ interiors are drenched in blood.

As chaos descends, everyone in the Pavilion scrambles to get out. High levels of deadly methane fill the tunnels. The structure begins to flood. For those who don’t drown, choke, or spark an explosion, another terrifying danger awaits—the thing that killed all those people on the train. It’s out there . . . and it’s coming. There’s something living beneath New York City, and it’s not happy we’ve woken it up.