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Long Island, 2010. The search for a missing woman leads to the discovery of multiple unidentified bodies, all connected by a disturbing common thread.

With a potential serial killer at large, the search for Shannan resumes — but the investigation stalls as a corruption scandal plagues local police.

A pivotal tip that was overlooked for years leads to an arrest at last. Dark details emerge, linking the killer to more homicides spanning two decades.