William Gibson - Neuromancer
Maybe more like not catching his drift rather than not understanding, or maybe I just got up on the wrong side of the bed that day.
Usually I feel like the onus is on me when it comes to works as well received as this one, but an hour after I started Neuromancer, I laid it down and never looked back.
As for C. S. Lewis, I am a big fan of Phillip Pullman, (His Dark Materials), as such I probably should try to read some C. S. Lewis for counterpoint, (I liked the Narnia movies), but I haven't found time or sufficient inclination to wade into his Christian philosophy.