Both the websites provided above are decent sources - certainly they are quite accessable and definitely free. But I would encourage you to read several sources as anything free on the Internet may or may not be the best information. Sparknotes summaries, for example, often leave out some of the most crucial details in the chapter-by-chapter summaries. Based on the random chapters you have listed, I assume you've definitely read the text (good for you if this is true). Read through the analysis provided by these two sources and also check out the link below. Anything you see repeated in all three is probably worth exploring. If any of these have vastly different information you might also explore that as well.