Though Predators are natural-born killers, one theory suggests they have a code of honor. Leave it to NYPD Detective Schaefer to find a Predator that doesn't share that theory. Deep in the heart of South America, Schaefer is hunting for a piece of his past -- his lost brother Dutch -- while another piece of his past -- a Predator he thought long dead -- stalks him through the dense, sweltering jungle. And when they finally lock horns, the "dark river" will run red!