"Confessions of Zeno" is a satirical, semi-autobiographical novel that follows the life of Zeno Cosini, a neurotic Italian businessman, as he tries to quit smoking. The book is presented as a diary, written at the suggestion of Zeno's psychoanalyst, and it details Zeno's thoughts on his health, his family, his business ventures, and his infatuation with a beautiful woman. Throughout the story, Zeno's attempts to quit smoking serve as a metaphor for his struggles with his personal weaknesses and his quest for self-understanding.

"Petersburg" is a symbolist novel set in the heart of Russia during the 1905 Revolution. It follows the story of a young man who is given the task of assassinating his own father, a high-ranking government official, by a radical political group. The narrative is a complex mix of politics, family drama, and philosophical introspection, all set against the backdrop of a city in turmoil. The novel is renowned for its vivid and poetic descriptions of the city itself, making Petersburg as much a character in the story as the people who inhabit it.

The book tells the story of a man who has his identity shattered when his wife casually notes that his nose tilts to the right, something he had never noticed before. This seemingly insignificant comment leads him into an obsessive quest to understand how he is perceived by others, and he gradually loses his sense of self as he fragments into a multitude of characters. The protagonist's existential crisis intensifies as he realizes that everyone he meets perceives him differently, leading him to question his own existence and ultimately, his sanity.