"The Book of Disquiet" is a posthumously published collection of thoughts and musings of a solitary dreamer, who is a Lisbon-based bookkeeper. The book delves into the mind of a man who is discontented with his mundane life and finds solace in dreaming and writing. The narrative is a profound reflection on life, solitude, and the nature of humanity, filled with philosophical insights and poetic language. The protagonist's introspective journey and his struggles with existential despair make it a seminal work in the genre of literary modernism.

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.

"Naked Masks" is a collection of five plays that delve into the complexities of human identity and the conflict between one's inner self and the roles imposed by society. The plays explore themes of madness, illusion, and existential uncertainty, often through characters who are caught in the tension between appearance and reality. The author uses the metaphor of the mask to represent the personas that individuals adopt in public, while questioning the nature of truth and the possibility of truly understanding oneself or others. The plays challenge audiences to consider the fluidity of identity and the performative aspects of everyday life.

This collection brings together the rich and varied poetic works of one of Portugal's most celebrated literary figures, a writer known for his multiple writing personas, or 'heteronyms.' The book showcases a selection of poems that delve into themes of existentialism, identity, and the nature of reality, reflecting the author's deep introspection and his fascination with the self and its multiplicities. The poems range from sonnets to free verse, each offering a window into the author's complex inner world and his philosophical musings, all while capturing the unique spirit of early 20th-century Portuguese culture.