I suggest you to read this stories
also I suggestyou this one
If your level is upper
I suggest you this one The Tenant of Willdfall hall
or this one The turn of the screw
by Henry James
the turn of the screw is an horror story
talk about ghost...
There are for instance Pengun Readers books. The books are deliberately simplified. You can pick and choose any sort you like.
I really don't know what to recommend. I had a thought like you once. I went to library and searching any book I like on English literature bookshelf by myself. I picked them up and screen the content. If I can understand more than 80%, I will read it. In my opinion, it's really hard to recommend a good book for others because each person has different taste. I knew this is not really help. I just want to share my experience. Hope you have a great day!
If you don't mind old books, try searching in Project Gutenberg.
As you have mentioned that you are at intermediate level, then I will suggest you to read books by following authors.
1. Roald Dhal
3. Agatha Christie
4. Jane Austen