Coco. Only four people in the whole world know what this word really means. Four Vietnam veterans: a doctor, a lawyer, a laborer and a writer. Completely different, they are connected by a common history and a monstrous secret. Now they will have to unite and go on a difficult journey that will lead them to the cemeteries of the Far East and the human jungle of New York. Not yet knowing what horror awaits them along the way, they, tormented by their conscience, will begin to look for someone who has risen from the darkness of the past with one single purpose: to kill.