I think the best 

1 uncle tom's cabin 

2 pide and prejudice 

The kite runner by Khaled Hosseini 

Mitch Albom books:

1) Have  a litle faith

2) For one more day

3) The five people you will meet in heaven

4) Tuesdays with Morrie

For me the books are not too thick and the language style/level difficulty  is probably suitable for you. You can learn from it. Happy reading.

Divergent series

The Silver Linings Playbook, To Kill a Mockingbird, stories by K.Mansfield, Catch Me if You Can.