My second book for the Classics Club's January readathon, Sophie's World by J. Gaarder has had a good effect on me.
I received it as a present in Greek, and I'm glad I read it like this, because the references to ancient Greek texts were left in the original - what a great treat to read some of the great writers of the time and their thoughts! Furthermore, I managed to read this enormous edition (all 610 pages of it) in two half days, which encouraged me to get some more of this kind for 2013.
The plot is a mixture of fiction and non-fiction: we get to read all the great philosophical concepts and ideas through an letter exchange between a girl, Sophie, and an enigmatic man who introduces a new subject to her with every letter.