A small Long Island town erupts in a panic when a woman and her dog are found savagely murdered on a popular hiking trail. Tasked with finding the sadistic killer, Homicide Detective Cassie Logan and FBI Agent Rick Sanders grow increasingly desperate after another woman is found dead at the same park, her body more gruesome and disturbing than the last. The killer and his unusual, but highly trained best friend are on the hunt. With the body count rising, Cassie and Rick fight to stay a step ahead of him. But how do you catch a predator who evolves with each of his brutal attacks?