Koko. Only four men knew what it meant. Now they must stop it. They were Vietnam vets -- a doctor, a lawyer, a working stiff, and a writer. They were as different as men could be. Yet all of them were eternally bound by a single shattering secret. Now, they have been reunited and are about to embark on a quest that will take from Washington, D.C., to the graveyards and fleshpots of the Far East to the human jungle of New York, hunting someone from the past who has risen from the darkness to kill and kill and kill.