Reddit mentions of The Stranger

In no order:

The Gunslinger

Stranger In A Strange Land

Siddhartha

Ender’s Game

East of Eden

The Stranger

Existentialism and Human Emotions, by Sartre, is only 96 pages and quite an easy read. {ISBN-13: 978-0806509020} Existentialism and the Philosophical Tradition, [Raymond], gives a broad selection of thinkers throughout history, but it is pricey. {ISBN-13: 978-0132957755} Another approach would be texts that are not strictly philosophical yet present some existential points such as: The Plague, The Stranger, and The Rebel, all by Camus, Nausea by Sartre, Notes From Underground, by Dostoevsky, or Waiting For Godot by Beckett

For future reference, /r/askphilosophy exists for these kinds of questions.

Now, if you're looking for something more narrative that will allow you to get your feet wet, you have a few different options.

Sophie's World is really quite enjoyable, though I suppose its intended audience is probably younger than yourself.

If you're looking for something more mature, you might try philosophical fiction like Camus' The Stranger or Sartre's Nausea. Both are a great way to get into something philosophical without having to worry too much about terminology or technical language.

If you're looking for something more analytic (logic, phil math, phil science, etc.), you might try something like Russell's The Problems of Philosophy. It's a pretty good read and it's short.

If you're looking for a general introduction to philosophy, something more mature than Sophie's World but focused on the history of philosophy as opposed to a particular area, you might want to look at something like Russell's The History of Western Philosophy. If you do get more involved in philosophy, you'll discover that the book has its flaws, and Russell was wrong about several of the philosophers that he discusses, but it's a good introduction to the history of philosophy that is easily accessible if you have the time to sit down and read it.

In terms of which one's are more fun to read, I'd say the philosophical fiction and Sophie's World are at the top, as the other two books are a bit more dry, but if you're looking for something substantive and not too technical, then all of these might serve your purposes.

I hope that helped in some way, and in future, if you have any philosophy related questions, don't hesitate to ask over in /r/askphilosophy.

Camus was both an essay writer and a fiction author, so reading a piece of each is a good idea. The Stranger would be his best work of fiction to read, and "The Myth of Sisyphus" his best essay. It really lays out his ideas regarding the absurd. It usually appears in a book called The Myth of Sisyphus and Other Essays. Both books, especially the first, are in most libraries.
I haven't read Kierkegaard, but I've heard that Either/Or is both a simple read and puts his ideas on display. If you'd prefer to read it online, here's a link that I found.

The Stranger. It's a short book, but one of my favorites.

Have you ever read this book? I highly suggest it.

You can go read "The Stranger" in a day.
This is a nice little Video about Albert Camus

https://en.wikipedia.org/wiki/Absurdism

Might as well check the wiki.

http://www.camus-society.com/ has a lot of good stuff. You can find The Myth of Sisyphus his essay online for free right here.

I spent 33 years an angry man who was basically just an Anti Theist. Camus view on the world is amazing and once you accept and live with the reality it is absurd everything is amazing. Very much a hippy epiphany.

Sartre presented a lecture called "Existentialism and Humanism," which can now be found in print as Existentialism is a Humanism. It's almost like an Existentialism manefesto, per se. The Myth of Sisyphus by Albert Camus is a good treatise on existentialism (Absurdism, really, but it'll do).

I would not hesitate to start reading fiction novels that have Existentialist themes. Camus' The Stranger, Sartre's Nausea, and Dostyevsky's Notes From the Underground are just a few that will find your studies well.

As for secondary literature, the only text I can knowledgeably recommend is Existentialism For Dummies, as I'm currently working my way through it. It's actually not as bad as you might think coming from the "For Dummies" series. It doesn't go too in-depth, and ideas are very concise and oftentimes humorous.

I have also heard good things about David Cogswell's Existentialism For Beginners, though I have never read it myself.

If your niece feels comfortable with this level of writing and philosophical examination, it is almost imperative to read Kierkegaard's Either/Or and Fear and Trembling, Nietzsche's Beyond Good and Evil: Prelude to a Philosophy of the Future, and Sartre's Being and Nothingness, among others. It is good to have some background understanding of Kant and perhaps have a few essays by Schopenhauer under your belt leading up to the more rigorous academics like Heidegger and Hegel.

Good luck, and happy reading!

I'm pretty awesomely adept at Greek mythology and literature.

Some of my favorite literature:

[Waiting for Godot] (http://www.amazon.com/Waiting-Godot-Eng-rev-Tragicomedy/dp/080214442X/ref=sr_1_1?s=books&ie=UTF8&qid=1368735525&sr=1-1&keywords=waiting+for+godot) by Samuel Beckett

[The Stranger] (http://www.amazon.com/Stranger-Albert-Camus/dp/0679720200/ref=sr_1_1?s=books&ie=UTF8&qid=1368735498&sr=1-1&keywords=the+stranger+by+albert+camus) by Albert Camus

[Shades of Grey] (http://www.amazon.com/Shades-Grey-Novel-Jasper-Fforde/dp/0143118587) by Jasper Fforde

[The Diamond as Big as the Ritz] (http://www.amazon.com/Diamond-Big-Ritz-Scott-Fitzgerald/dp/1603551050/ref=sr_1_2?s=books&ie=UTF8&qid=1368735594&sr=1-2&keywords=diamond+as+big+as+the+ritz) by F. Scott Fitzgerald

Book: The Stranger by Albert Camus. I read it my Sr Year of High school and we discussed/analyzed it and I couldn't stop myself from writing all over it. At the end I actually stayed back to tell my teacher how much this book affected me and the way I saw the world and my teacher let me keep it. It's still on my shelf, very worn out and annotated to hell. It's one of my most treasured possessions.

if you want to know what it's like go read The Stranger By Albert Camus

To this day there is still no greater book for opening up the world of thought than Will Durant's The Story of Philosophy. This book is indispensable.

Aside from that the best advice, as many here have noted, is to simply read widely and often. Here are some other books I can personally recommend as being particularly insightful:

• Wind, Sand and Stars
  
• Einstein's Dreams
  
• Family Happiness
  
• Borges
  
• Kafka
  
• Tao Te Ching
  
• Book of Job
  
• The Stranger
  
• Prometheus Rising
  
• Shakespeare

It is from one of his books.
http://www.amazon.com/The-Stranger-Albert-Camus/dp/0679720200

• How to Win Friends and Influence People By Dale Carnegie
  
  
• The Stranger by Albert Camus
  
  
• Beyond Good and Evil
  
  

well if you want to ease into it, go for some Albert Camus fiction
the fall (le (la??) chute)
http://www.amazon.com/Fall-Albert-Camus/dp/0679720227
the stranger (l'etranger)
http://www.amazon.com/Stranger-Albert-Camus/dp/0679720200
the cure song, killing an arab is about the above
http://www.youtube.com/watch?v=y7lULaE6kv4