The Stranger is a haunting, challenging masterpiece of literature. While it is fiction, it actually manages to express the complex concepts and themes of existential philosophy better than the movement's most noted philosophical writings and almost as well as Dostoyevsky's Notes From the Underground. This is a new kind of literature. The story in and of itself is rather simple, but the glimpses into the intellect and feelings of the protagonist are the sources of the magic of this novel. M.Meursault is a normal man in Algiers, France. When we meet him, he is on the way to his mother's funeral, where he says very little, expresses no remorse over her death, and immediately returns home. The next day, he goes swimming, meets Marie, takes her to see a comedy that night, and spends the next few weeks living his normal life and occassionally seeing Marie. He ends up getting indirectly involved in a dispute between his neighbor Raymond and a girl who did him wrong, and the conflict culminates in an encounter on the beach between Raymond, Meursault, and the girl's Arab brother and friend. Raymond is cut with a knife, but the whole episode seems to be resolved. Meursault, though, decides later to take another walk on the beach because he is too worn out to go inside and rejoin his friends, and somewhat inexplicably he ends up killing one of the Arabs. The second half of the novel examines Meursault's thoughts in relation to his trial and sentence; interestingly, he is prosecuted as much if not more for his moral character than for the crime of murder itself.
Basically, Meursault does not care about anything, does not feel anything for anyone (including himself, for the most part). He looks at life objectively and determines that it really doesn't matter whether he does something or not in the overall scheme of things. When Marie expresses her love for him, he tells her he will marry her if it will make her happy but that he cannot say he really loves her. He expresses no remorse for killing the Arab because it just happened; he had no intention of doing it, but the fact is that he did, so there's little point in dwelling on it. He cares about the present and, to a lesser degree, the future, but the past is meaningless for the very reason that it is the past. Meursault sees things as they are; rather than rely on flights of fantasy and imagination (the typical tools of the Romanticists), he deals with facts in the here and now rather than run from them and has no problem admitting the seemingly obvious fact that man is a creature of utter depravity. He rejects religion; since each man must eventually die, what does it matter what he does while on earth. It is a man's hopes and dreams that weigh down his very existence; Marsault can only find happiness by cleansing himself of all such illusory notions.
Needless to say, this is not an uplifting book, but it is an engaging, thought-provoking one. While Camus cannot be called a true existentialist in his own philosophical outlook, his fiction does epitomize many existentialist ideas. Marsault is a protagonist like no other in literature--you cannot like him, he is obviously guilty of killing a man in cold blood, and he is of a cold-hearted nature, yet you do understand some of his thinking, find yourself more and more interested in his dark outlook on life, and have to admit that much of what he believes makes sense.