Currently, Vanity Fair by William Makepeace Thackeray.
Because I had run across several references to Becky Sharp, and I didn’t get them. One was in I Capture the Castle, and I believe the most recent was in an episode of Doctor Who.
I’ve always been one of those people who, if I don’t understand something, I go look it up. It used to be running to the dictionary or encyclopedia, now it’s off to Google, but the principle is the same. My parents and teachers were always insisting I look up answers to my own questions, and the habit has stuck.