Yes, you're correct that "The Stranger" by Albert Camus is indeed a work of fiction. However, it's also considered a significant piece of existentialist literature. Through the novel, Camus explores existentialism and the idea of absurdity - the belief that life is devoid of any purpose or meaning beyond individual existence. While not a traditional philosophical text, it offers an approachable introduction to these philosophical concepts.

However, if you're looking for non-fiction introductory texts, here are a few more options:

1. "Sophie's World" by Jostein Gaarder: This is a novel that also serves as a basic guide to philosophy. It presents the history of philosophy in a narrative format which makes it accessible for beginners.

2. "The Problems of Philosophy" by Bertrand Russell: A concise guide to the fundamental problems of philosophy, this is a great entry point to philosophical thinking.

3. "Think: A Compelling Introduction to Philosophy" by Simon Blackburn: This book introduces readers to the major fields of philosophy, including knowledge, the mind, free will, the self, God, and ethics.

4. "The Story of Philosophy" by Will Durant: This book provides a sweeping overview of Western philosophy, featuring profiles of major philosophers and key concepts.

Remember, philosophy can be a challenging field to understand, but it's also one that encourages critical thinking, questioning, and reflection. It's okay to read a passage or chapter multiple times, and to take the time to contemplate the ideas presented. Enjoy the journey!
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