This true-crime documentary series tells one of two terrifying tales. If its subject, writer and researcher Maury Terry, was correct, the Son of Sam murders weren’t committed by a lone postal worker acting out some unfathomable personal psychodrama, but instead committed by an organized cabal of devil worshippers who have never faced justice.

If Terry was wrong (and it seems to me that he was), it’s the story of a brilliant, talented journalist so obsessed by a farfetched theory that he throws away his entire life trying to prove it. Either way, it’s a fascinating and scary docu-series.

Where to watch: Netflix