Ferit, a former medical student who shifted to philosophy, finds himself tormented by doubt, hesitation, and existential depression. His strict materialist and positivist worldview begins to crumble as he encounters extraordinary events he cannot explain. Living in a boarding house in Yüksekkaldırım populated by eccentric characters, his psychological state deteriorates further over six tumultuous days, exacerbated by conflicts with his girlfriend, Selma. Amidst this turmoil, he finds a crucial anchor in Aziz, a fellow resident who supports him through his darkest moments.

Following the mysterious death of his aunt and a sudden inheritance, Ferit follows Aziz's advice to rent a house on the island to recover from his trauma. The house belonged to Mademoiselle Noraliya, a mysterious woman who died a year prior. Regarded by Peyami Safa as his personal favorite among his works, The Armchair of Mademoiselle Noraliya is widely acclaimed by critics as one of the most profound psychological novels in Turkish literature, mastering narrative technique to explore the boundaries between the physical and spiritual worlds.