The Plague is Camus' most novel-ish book and least philosophical. There is philosophy there (should a doctor resist an inevitable plague?) but there is also a lot of metaphor (many read it as an allegory for nazi-sympathizing france) and even just classic character development. This is very different from The Stranger, which spends like 1/3 of its words on a philosophical conversation, or something like Myth of Sisyphus, which doesn't even attempt to be a story.

I've thought a lot about this book this year, though I haven't read it since I was a teen.