The Silence of the Lambs is an unadapted novel.
It was only the third film , the other two being It Happened One Night and One Flew Over the Cuckoo 's Nest , to win Academy Awards in all the top five categories : Best Picture , Best Actor , Best Actress , Best Director , and Adapted Screenplay .	It Happened One Night	It Happened One Night	top five categories	List of Big Five Academy Award winners and nominees	Best Picture	Academy Award for Best Picture	Best Actor	Academy Award for Best Actor	Best Actress	Academy Award for Best Actress	Best Director	Academy Award for Best Director	Adapted Screenplay	Academy Award for Best Adapted Screenplay
