The idiot by Dostoevsky. I am enjoying it quite a bit, I am nearly done. I'm 30 years old, and I read my first of his back in 2011, Crime and Punishment. I've also read Brothers Karamazov. I used to find reading him to be difficult to fully understand, but I feel I am understanding it much better these days. I guess you really do get smarter in some ways with age.