Witnesses relocated and given new identities by the US Marshalls are being found and killed. As the Marshalls seem to be unable to find out why this is happening or to stop the assassin Level 9 are activated. They are an ultra secret, cyber ops rapid response unit, designed to fight high tech crimes and to use top range technology to hunt down criminals. Their assignment is to find out who the assassin is and stop him.

Level 9 is given the job of stopping a hacker called Thrillseeker from destroying a communication satellite system that would severely affect America's security. Annie sends Travis undercover at a hacker convention in Las Vegas called 'Defcon' to try and see if he can find out who 'Thrillseeker' is.

From a tip supplied by a snitch Jack Wiley enlists the aid of Level 9 to raid a group of hackers who ar ein the process of selling a list of top secret NATO safehouses, in Iraq, to Saddam Hussain. The hackers wipe their computers and while Level 9 try to find the information they come across some stolen plane codes, used for controlling a new super-computer controlled plane. Later, while undergoing evaluation tests, the computer piloted passenger jet is electronically hijacked and crashed. It's only passengers, two supervising pilots, are killed. The hijacker soon makes his demands known and threatens to take down an airliner fully loaded with passengers if they are not met. Level 9 must capture this cyber-jacker and locate and de-program his digital bomb before it sends a plane full of passengers plummeting to their deaths.

Justin Malik ('Mail Call') is in a maximum security hospital prison, somewhere he has no intention of staying. Using an orderlies laptop he arrnages his own release and sets about getting in touch with, and meeting up with, the mythical main man of the hacking world, and number one target for Level 9, 'Crazy Horse'

A serial killer is targetting girls who work in the internet sex industry. He is tracing the home addresses of those who strip in front of their own web cameras and then killing them why they are online. Sosh takes this personally and begins her own 'cyber' investigation, against Annies instructions, and takes more and more risks while doing so. Meanwhile the rest of the team are running down leads in the real world, trying to catch the killer before he strikes again.