Someone help me find these two fiction books..

[lvthypain]

Someone help me find names of these two fiction books..

I don't remember the exact names or author i know that they are two fiction books in a series. they are old books and translated from German. the author is supposed to be the most intelligent person or something..

if anyone can narrow it down please post

 

[Sleepy]

Mind telling a bit from the story ? I am German and I probabbly know the author and names.