For the seasoned warriors of America's most elite and covert defence unit, each mission could be their last. Now a grim Presidential directive comes down hard, green-lighting a desperate search-and-destroy operation where minutes count.An unknown entity is in possession of one of the deadliest weapons known to man, sounding a death knell for nations across the globe.It kills instantly. No heat, no noise, no radiation. Just silent, invisible slaughter from ultra-fast subatomic particles. The death toll mounts in a random, controlled carnage that is sending a clear message of absolute power–while leaving false trails and conflicting clues. No nation can defend itself against the unilateral destructive power of a particle beam weapon. Stony Man's only option is to destroy it. But first they must find it….