"Molloy" is a complex and enigmatic novel that follows the journey of its eponymous character, an elderly, disabled vagabond, who is tasked with finding and killing a certain person. The narrative is split into two parts: the first is told from Molloy's perspective as he navigates his way through a strange and often hostile world, while the second follows a detective named Moran who is assigned to find Molloy. The novel is renowned for its challenging narrative structure, its bleak and absurdist humor, and its profound exploration of themes such as identity, existence, and the human condition.

The novel follows a historian living in a small French town, struggling with a strange and unsettling feeling of disgust and revulsion he calls 'nausea'. He grapples with the existential dread of his own existence and the meaningless of life, continually questioning his own perceptions and the nature of reality. As he navigates through his everyday life, he is plagued by his philosophical thoughts and the overwhelming sensation of nausea, leading him to a profound existential crisis.

The novel follows the life of an eccentric aristocrat who retreats from society to live in isolation, dedicating himself to the pursuit of excessive aestheticism. He surrounds himself with art, literature, and music, and indulges in sensual pleasures and extravagant interior decoration. The protagonist's obsession with artifice over nature and his quest for absolute individualism and self-gratification are explored, reflecting the decadent movement of the late 19th-century France.

"On the Heights of Despair" is a philosophical exploration of the human condition, particularly focusing on themes such as existentialism, despair, and nihilism. The author delves into the idea of life as suffering and the inevitability of death, offering a bleak yet thought-provoking perspective on existence. The work is a profound contemplation of life's absurdity, loneliness, and the struggle to find meaning, presenting an introspective journey into the depths of despair and the heights of existential thought.