The fourth book in the "Harry Potter" series written by J. K. Rowling sold over 55 million copies worldwide after its publication in 2000. The book attracted additional attention because of a pre-publication warning from J. K. Rowling that one of the characters would be murdered in the book. The novel won a Hugo Award in 2001 it was the only Harry Potter novel to do so. The book was made into a film, which was released worldwide on 18 November 2005. It sold 3 million copies of the book were sold over the first weekend in the US alone.