No, not Harry Potter. Not Charlie and the Chocolate Factory. Not a Series of Unfortunate Events. These are books (or book series) that are less well known. Some book you found at the library as a child without any prior knowledge of it. A book most haven't heard of.
The one that sticks out the most to me is "Into the Candlelit Room"
I found it at my school library. Without reading the inside of the jacket or even looking at the title page I started reading.
Incase you want to track down the book for yourself, I made a spoiler block.
The story is told through the journal entries of a young boy. He lives with a his low income family, dealing with the death of his mother. He runs into an elderly man who recently runs into town. They get along fairly well and the boy helps the man around his house, which is the titular candlelit room.
The two of them quickly begin bonding. The man gives him a diary to write in, which the boy uses to explain the current experience. They discuss the boy's family and his deceased mother. He decides to bring over a picture of his mother to show the man. When he take it back home and puts it back in the frame the parent notice the picture looks like it's damaged on the sides. The boy lies but is unsure of why that is.
The boy continues to help the man, despite his family's wishes. He helps him organize books, which seem to be written in some strange foreign language. Eventually one night the man asks the boy to help him. The boy begins to lead him around until they go into one building. The elderly man's skin begins to burn as he bursts into flame, after having entered the church.
The boy realized that the man was reading his thoughts through his diary entries and that the language in the books was not of any human civilization. He was some entity from hell.
I noticed I wasn't very far into the book. I turned to the title page and saw "Into the Candlelit Room and Other Tales" I read the inside jacket. This was a collection of horror stories. This lack of knowledge made this one of the most shocking endings that I could possibly imagine. There was something special knowing that such a moment could rarely be repeated. Few people probably experience that book the way I did.
So what are some obscure books you remember fondly as a child.