Maniac Harry, the unstoppable masked killer causing a significant drop in NYC property values, savagely slashes his way down the length of a packed subway car.

Can exhausted commuter Gabriella Acosta keep ahead of the Maniac long enough to save two children from his blade? Meanwhile, Gina Greene of the Maniac Task Force and NYPD detec-tive Zelda Pettibone are willing to do anything to save those passengers — but time is running out, and the Mayor is ready to sacrifice everyone on board if it means trapping Harry for good.