In the book, Winston does not receive a book from anyone. He finds the book himself, hidden in an antique shop. The book is a pre-Revolution diary of a man who believed in the Party but later became disillusioned and critical. This diary plays a crucial role in Winston's rebellion and his search for truth.
It is important to remember that the novel is set in a dystopian future where free thought is suppressed and the past is constantly rewritten. The existence of the book itself is a symbol of resistance and the potential for truth to survive even under the most oppressive regimes.