This true crime documentary series tells one of two terrifying stories. If their subject, the writer and researcher Maury Terry, was correct, the murders of Son of Sam were not committed by a lone postal worker performing some unfathomable personal psychodrama, but by an organized cabal of devil worshipers who were never brought to justice.

If Terry was wrong (and it seems to me he was), it’s the story of a brilliant, talented journalist who is so obsessed with a far-fetched theory that he throws his whole life away to prove it. Either way, it’s a fascinating and scary documentary series.

Where to see: Netflix