Few know he exists.But when millions of American lives are at stake, Third Echelon special operative Sam Fisher is the man to depend on.He handles covert misions either too sensitive or too risky for even the CIA os FBI.And operates alone.Fisher is called off of a training exercise to intercept a cargo freighter loaded down with radioactive material and heading straight for the U.S coast.He has minutes to disable the ship-or die trying.While he races to beat the clock, another attack has its target.As the residents of a small town in New Mexico start dying of radation poisoning, Fisher weaves through a tangled web of clues to find the mastermind behind the strikes:One of the greatest enemies of the free world...