When searching for a missing woman, law enforcement on Long Island stumble upon the remains of other victims; as the killer of the so-called "Gilgo Four" remains elusive, police come to believe that the monster himself may live among them.

After Rex Heuermann is arrested and charged as the Gilgo Beach killer, a feverish hunt for information is undertaken -- but his family isn't talking; now, for the first time, the loved ones of the alleged killer speak publicly.

With a mountain of seemingly damning evidence stacking up against him, Rex Heuermann's family struggles to understand how their beloved patriarch could be the monstrous serial killer law enforcement claims he is.