I read The Myth of Sisyphus in college and didn’t understand it at all. I read The Stranger a few years ago and didn’t really enjoy it. So it was good to start reading The Plague and find it both understandable and enjoyable (or as enjoyable as the subject matter would allow).
The plague in question is the bubonic plague. It strikes a city in Algeria in modern times, killing thousands of people. For months, nobody is allowed to enter or leave the city. The novel has relatively few descriptions of the physical effects of the disease. There is more said about its psychological effects. We follow the activities of Dr. Rieux, who does whatever he can to help his patients, and a small number of his acquaintances, some of whom become his friends as the months go by.
The Plague is sometimes described as an “existentialist” novel, although Camus apparently disliked that term. It certainly does concern human existence, and human existence under great stress. I haven’t checked to see whether the plague is supposed to symbolize something. What I took away from the novel is that most people will rise to the occasion, as we see whenever a disaster occurs. It also occurred to me that all of us are quarantined on this planet, with no possibility of escape, and that we are all going to succumb to something sooner or later. The difference is that some of the characters in the novel get out alive.