Lurking in the dark waters of Long Island Sound is a mysterious place known as Plum Island. Just ten miles off the coast of Connecticut, this tiny speck of land has long been rumored to be the epicenter of top-secret biowarfare research. The U.S. government acknowledges that the island is home to a scientific facility. Its stated purpose is to study animal-borne diseases. But investigators are beginning to uncover startling new facts about this forbidding place. Insiders and ex-employees have come forward to tell their stories. From security breaches in germ labs, to escaped diseases and potential mass epidemics, this is the real Plum Island story.