A horrible night in a horrible place turns far worse when a malevolent entity manages to become more terrifying than the war all around. Army Warrant Officer Jim Nix is an outcast with just one chance to avoid a sentence in Leavenworth: lead a platoon into the notorious Song Ba valley for just one night. A simple operation, Nix thinks. But nothing can prepare him for what awaits his men and him--something much deadlier than mere flesh-and-blood enemies--an incredibly powerful entity determined to kill every living thing in its path...