Is it even Halloween anymore if Netflix isn’t unveiling a hot new horror series from Mike Flanagan? Over the past few autumns, the writer-director behind the Stephen King movies Gerald’s Game and Doctor Sleep has contributed to TV’s small but growing horror canon with hit reimaginings of Shirley Jackson’s The Haunting of Hill House and Henry James’ The Turn of the Screw (rebranded as The Haunting of Bly Manor).