They don't see him, but he's there. Plotting. Planning, and anticipating every move they make. This terrifying thriller follows a psychopath as he imprisons a little girl and a famous reporter in the dank maze of tunnels beneath New York City's Grand Central Station. He first wants to collect a ransom, and then murder his captives. His victims. the only hope is their wits and the aid of homeless people who roam this urban netherworld.

Four people's lives have been shattered by a murder. Steve Peterson, magazine editor, whose wife Nina has been killed; their young son, Neil, who saw the murder committed; Sharon a young journalist who has fallen in love with Steve; and Ronald Thompson, the convicted killer who is about to be executed for Nina's murder though he has continuously maintained his innocence. There is a fifth person who waits and watches.