Having submitted this review in spanish and not having it posted, I'll try again in english.......
Camus reached fame with his elaborations about the concept of the absurd (the purposeless search of the meaning of existence in a universe void of any)in three works: The Stranger, a novel; Caligula, a teathrical opus; and The Myth of Sisyphus, a recopilation of philosophical essays.
In his second famous novel, The Plague, we find a different Camus. Perhaps, more concerned about moral values and solidarity between human beings, in the face of massive destruction.
The plot of the novel unfolds in the city of Oran, Algeria. The central image has to do with a rat invasion that causes a plague epidemy, with disastrous consecuences. Here we find metaphorically portraited the invasion by the Nazis in 1943 of non occupied France (Camus said that the Nazis came like rats).
Then we find a description of the evolution of the plague, the reaction of the authorities (at first, self denial), the progressive isolation of the town from outside world, and on the onset the "normalization" of the tragedy (people grow accostumed to live with it, and become zombies). After the evolution and the growth of the problem, the inhabitants become completely isolated from the outside, and become prisoners in the inside, due to the drastic measures taken by the authorities. The plague becomes a collective problem that requires recognition and reaction by all. We have here a clear metaphorical reference to the need of a collective reaction to the Vichy government by all the citizens. The call to participate and react becomes a moral issue. Camus then describes with certain detail the soccer stadium where people are forcibly concentrated by the authorities, and this is an allusion to the Nazi concentration camps. More than the persons, the protagonist of this novel is the city.
In the sense that the values of solidarity and participation against a common disaster or enemy are called for, this novel is much more developed, from an ethical standpoint, than The Stranger.