It is packed with passengers and the ransom is one million dollars. The NYPD frantically pursue the train on the city streets, but the question remains: the subway is a closed system - surely there is no way out... But the four hijackers, led by a mercenary named Ryder, have thought about this.

And once they receive their ransom money, they plan to send the train off at top speed toward the terminal station where it will crash, killing all the passengers..