After a wave of mauled marine life washes ashore in New York, conservation biologist Dr. Craig O'Connell launches an investigation to find the culprit. When it leads to an old nuclear dumping ground teaming with great whites and makos, he is left with the chilling theory that the predator may be radioactive. A deeper dive reveals an unexpected hotspot for massive makos off the coast of the Hamptons, suggesting that these waters may be hiding something even bigger beneath the surface.