I suggest you to read this stories 

Macbeth 

William Shakespeare

also I suggestyou this one

Great Expectation 

Charles Dickens

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... 

Hi.

There are for instance Pengun Readers books. The books are deliberately simplified. You can pick and choose any sort you like.

http://www.penguinreaders.com/

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

2. P.G.Wodehouse 

3. Agatha Christie

4. Jane Austen

5. J.K.Rowling