One of the notable horror fiction books from 1986 could be 'It' by Stephen King. It's a classic that features a terrifying clown named Pennywise who preys on the children of Derry. The story is filled with elements of fear, mystery, and the power of friendship as the characters face their childhood traumas.
I'm not sure which specific books are on that list exactly, but some popular horror themes in 1986 might have included haunted houses. There could be a book about a family moving into an old, spooky mansion where strange things start to happen. Doors open and close by themselves, cold spots are felt, and there are unexplained noises at night.
Well, without seeing the full list of 1986 horror fiction books, it's hard to be exact. However, horror books from that era often delved into the supernatural. Maybe there was a book about a cursed object. A small trinket that brought misfortune and death to whoever possessed it. The protagonist would have to figure out how to break the curse before it was too late.