It's a one season long show that revives really old horror books into modernish times.
So far the classics they've done are:

• The Haunting of Hill House (written 1959)
• The Turn of the Screw (written 1898), called The Haunting of Bly Manor
• The Fall of the House of Usher (written 1839)

Hill House, the first mini-series, is very good and outshines the others by a long shot, IMO.