What is the fine-grained topic of the following text: I'm SO bad with "popular" books, so thought I was going to hate this - only read it because I was in a bookswap circle and hence "didn't have a choice" - and how glad I am I did, because I would have missed it, and I thought it was brilliant (aside from the heaven bits, which I found a touch on the cheesy side). Only return the topic.
Reading a popular book due to bookswap participation and enjoying it despite initial expectations.