Existential literature, epitomized by works like Albert Camus’ “The Stranger,” delves into the depths of human existence, exploring themes of absurdity, freedom, and the search for meaning in a seemingly indifferent universe. Camus, a leading figure in the existential movement, uses “The Stranger” to illustrate his philosophy of the absurd, a key concept in existential thought. The novel's protagonist, Meursault, embodies the existential hero, a character who confronts the inherent absurdity of life and the inevitability of death. 

“The Stranger” opens with Meursault’s indifferent reaction to his mother’s death, an event that sets the tone for the novel’s exploration of alienation and emotional detachment. Meursault's lack of conventional emotional response challenges societal norms and expectations, positioning him as an outsider. This emotional detachment is a central tenet of the novel, highlighting the absurdity of the human condition and the arbitrariness of societal values. 

Camus' narrative style in “The Stranger” is characterized by its simplicity and detachment, mirroring Meursault’s own disconnection from the world around him. The prose is devoid of embellishment, reflecting the protagonist’s straightforward and unemotional view of life. This narrative approach effectively conveys the themes of existentialism, particularly the notion of absurdity. The absurd arises from the conflict between the human tendency to seek inherent value and meaning in life and the universe's cold indifference to these human endeavors. 

The novel progresses to explore the theme of existential freedom, especially in the context of Meursault's trial for murder. The trial serves as a metaphor for society's attempt to impose meaning and morality on an individual’s actions. Meursault's refusal to conform to societal expectations and his insistence on the truth of his own experience, even when it leads to his condemnation, underscores the existential belief in the primacy of personal freedom and authenticity. 

Furthermore, “The Stranger” delves into the idea of existential angst, a deep-seated anxiety arising from the awareness of one’s freedom and the inevitability of death. Meursault’s confrontation with his own mortality in prison brings a profound clarity and acceptance of the absurdity of life. His final epiphany, rejecting the comforting illusions of religion and embracing the indifferent universe, marks a pivotal moment in existential literature. It signifies the acceptance of life’s inherent meaninglessness and the liberation that comes with this realization. 

Camus also explores the theme of existential isolation, the idea that individuals are fundamentally alone in their subjective experiences. Meursault’s isolation is both physical, as he is separated from society by his imprisonment, and existential, reflecting his philosophical detachment from conventional beliefs and values. 

In conclusion, Albert Camus’ “The Stranger” is a quintessential work of existential literature, masterfully exploring themes of absurdity, freedom, and existential angst. Through the character of Meursault, Camus challenges readers to confront the fundamental aspects of the human condition: our search for meaning, our confrontation with death, and our struggle for authenticity in a world that often seems irrational and indifferent. The novel remains a profound and unsettling exploration of existential philosophy, offering insights into the complexities of human existence and the perpetual quest for understanding in an enigmatic world.