Not bad!
You were wrong about Oliver Twist (I think Oliver is a pretty bad protagonist), Dirk Gently (Great show, only learned about Max Landis after I finished watching - it was pretty depressing though not at all surprising) and the fountainhead (loved it when I first read it as a teenager, since then I've changed my mind on it a little, but it still has a special place in my heart).

All in all, great guessing skills, and you even gave me an idea for my next post - so thanks for that!