Veronika decides to end her life after concluding that her existence is meaningless and that she has no power to change the world. Surviving her suicide attempt, she is committed to a mental institution where she confronts the nature of sanity and the ethics of involuntary treatment. Within the confines of the hospital, Veronika grapples with her own mortality and the possibility of finding meaning even in the face of despair, all while navigating the complex relationships with other patients and staff.

The novel is presented as a fable-like story that uses a fictional character to explore profound themes of life, death, and mental illness. Its narrative strength is noted for its instrumental role in influencing new government regulations in Brazil regarding involuntary commitment. The book is recognized for its ability to use fiction to comment on and potentially alter reality, a characteristic attributed to Coelho's storytelling prowess. The work is framed as a dramatic exploration of existence, emphasizing the choices individuals make in living and dying.