David Lewis

Good!

If you want some thorough and in-depth help understanding Lewis, this is currently the only going concern (sounds like something Lewis would say), and so we should count ourselves as lucky that it is so good. And if you want to understand Lewis, you will probably need some help. Though Lewis' writing style is clear, energetic, and funny, making him a breeze to read, picking up something he has written is like jumping into the middle of an email thread on an esoteric topic between people who have been discussing it for decades. He does not provide the context himself for why someone who hasn't been already thinking about a particular topic for years should care about it. This is, of course, true of a great many philosophers, but Lewis's breezy style makes it particularly stark.So, thank the Humean mosaic for Daniel Nolan. He doesn't bring the discourse quite down to the level of an average intelligent person, but he does pull it back enough that a person willing to put in the work can get a foothold on Lewis. If you need a suggestion, I'd say start with Nolan, read through chapter 3, then start Lewis' On The Plurality of Worlds, then go back and re-read some of Nolan, then some of Lewis, etc. etc. If plurality of worlds isn't your specific interest, then do this for whatever is. Also, Nolan's chapter 9, on Lewis' overall philosophical method, is an essential part of this starting process, to be read after you've read a little Lewis, even though it's at the end of Nolan's book.