Isso poderia ser a Rainha dos Anjos de Greg Bear . Da Wikipedia:
The central unifying element involves a famous writer, Emmanuel Goldsmith, who has committed a gruesome series of murders, a crime almost unheard of in the age of therapy. [...]
The third plot line concerns Martin Burke, a pioneer in psychotherapy who uses a technique which allows him to directly enter and interact with a patient's psychology - the "Country of the Mind" - through a sort of virtual reality. Although in a position of disgrace at the story's opening, Dr. Burke is given the opportunity to use his technique to explore Goldsmith's mind, which turns out to be one of the most fascinating and dangerous minds imaginable.