Harry Potter and the Half-Blood Prince Full Screen Play Filmscript ( 162 pages ) in a special Harry Potter binder Harry Potter and the Half-Blood Prince is a 2009 fantasy film directed by David Yates from a screenplay by Steve Kloves, based on the 2005 novel of the same name by J. K. Rowling. It is the sequel to Harry Potter and the Order of the Phoenix (2007) and the sixth instalment in the Harry Potter film series. It stars Daniel Radcliffe as Harry Potter, alongside Rupert Grint and Emma Watson as Harry's best friends Ron Weasley and Hermione Granger respectively. The story follows Harry's sixth year at Hogwarts as he receives a mysterious textbook, falls in love, and attempts to retrieve a memory that holds the key to Lord Voldemort's downfall.