The Brothers Karamazov is like the Compendium of Dostoevsky, the darkest and difficult one to read.
In the beginning, it seems very dense and impenetrable but if you keep insisting, the mind and experience of the characters became much clear.
My first and easiest one I read at 14 The Gambler and it was more accessible.
But Crime and Punishment is a masterpiece too.
Thanks for the comment. :)