I pretty much knew that C.S. Lewis was a good Latinist. He sort of had to be one, given his education. Plus, Lucretius is know to have influence the writer in his early years. So, when I saw a book called "The Latin Letters of C S Lewis" it caught my attention. Unfortunately, there is not much Latin about it :( It is just a translation. Thus far I was unable to locate the original Latin text of the letters.
The history behind this publication is as follows, in case anyone's interested:
In September 1947, after reading The Screwtape Letters in Italian, Fr. Giovanni Calabria was moved to write the author, but he knew no English, so he addressed his letter in Latin. Therein began a correspondence that was to outlive Fr. Calabria himself (he died in December 1954 and was succeeded in the correspondence by Fr. Luigi Pedrollo).