With Voldemort at large, Dumbledore gives Harry private lessons using memories from Tom Riddle's past. In Potions, Harry uses an old textbook full of notes by the "Half-Blood Prince" and tops the class. He suspects Draco Malfoy has become a Death Eater on a mission. With Slughorn's real memory, Harry learns about Horcruxes, objects where Voldemort hid pieces of his soul. He and Dumbledore go after one in a cave, and Dumbledore comes back weak. On the Astronomy Tower, Draco disarms Dumbledore but can't kill him; Snape does. While fleeing, Snape reveals he's the Half-Blood Prince. The locket from the cave was a fake signed "R.A.B." After the funeral, Harry decides not to return to Hogwarts and to hunt the remaining Horcruxes.
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5 differences
What changed in the movie
diferencaThe Burrow burns only in the film
The film adds a Death Eater attack on the Burrow at Christmas, with the house set on fire. It never happens in the book.
In the book, Dumbledore shows Harry memories of the Gaunt family and Voldemort's mother, Merope. The film keeps only the orphanage and the Slughorn conversation.
In the book, Dumbledore freezes Harry under the Invisibility Cloak, so he watches everything unable to move. In the film, Dumbledore just tells him to hide below.
In the book, Death Eaters fight the Order and the D.A. inside Hogwarts before the tower scene. In the film it's reduced to Bellatrix wrecking the Great Hall.
No spoilersThe easter eggs give away parts of the title. They open once you mark it as seen.
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