From the liner notes

Growing up on Staten Island, filmmakers Joshua Zeman and Barbara Brancaccio had often heard the legend of Cropsey. For the kids in their neighborhood, Cropsey was the escaped mental patient who lived in the old, abandoned Willowbrook Mental Institution and would come out at night to snatch children off the streets. Later as teenagers, the filmmakers assumed Cropsey was just an urban legend: a cautionary tale used to keep them out of those abandoned buildings. That all changed in the summer of 1987 when 12–year–old Jennifer Schweiger disappeared from their community.

Now as adults Joshua and Barbara have returned to Staten Island to create Cropsey, a feature documentary that delves into the mystery behind Jennifer and four additional missing children. The film also investigates Andre Rand, the real–life boogeyman linked to their disappearances. Embarking on a mysterious journey into the underbelly of their forgotten borough, these filmmakers uncover a reality that is more terrifying than any urban legend.