This season travel around Harry’s 6th twelvemonth at Hogwarts. The first thing is to welcome a new prof, Horace Slughorn, who teach Harry a lot of astonishing things about toxicant. In the film, Slughorn give Harry a tatterdemalion book which belong to The Half-Blood Prince that has many scribble note in the border of each page with tip to assist Harry advancement in thaumaturgy. One more than thing is Dumbledore open a category for Harry and he even show Harry see the memory of the dark secret of Voldemort in the past times.