In the shadows of their past, four Vietnam veterans are bound by a secret so dark it threatens to consume them whole. A doctor, a lawyer, a laborer, and a writer - each has carved a different path since the war, yet all are inextricably linked by the specter of what they left behind. As a series of brutal murders bearing the sinister mark of "KOKO" begins to surface, these men are pulled from their disparate lives into a hunt that will force them to confront not only the killer but the war-torn shadows within themselves. From the power corridors of Washington, D.C., to the neon-lit alleys of the Far East, and into the dense mazes of New York, their journey is one of harrowing adventure and psychological suspense, a desperate race against time and an unseen foe with the cunning to hide in plain sight. Peter Straub masterfully weaves a tale of intrigue and deep psychological horror in "Koko," plunging the reader into an abyss where the horrors of war collide with the darkest realms of the human psyche. As the narrative unfolds, the quest becomes not just to stop a relentless killer, but to salvage the very soul of each man. Straub's chilling prose elevates this novel from a mere thriller to a profound exploration of the impact of war and the concept of evil, making "Koko" a compelling, unsettling journey into the heart of darkness that lingers long after the last page is turned.