For the seasoned warriors of America's most elite and covert defense 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 ultrafast, 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...