<P> The next morning, Harry, Ron, and Hermione get their Ordinary Wizarding Level (O.W.L.) results, along with lists of school supplies . Later, Harry, Ron Weasley and Hermione Granger follow Draco to Dark Arts supplier Borgin and Burkes . Harry is instantly suspicious of Draco, whom he believes to be a Death Eater . </P> <P> On the Hogwarts Express, Harry discusses his suspicions of Draco's allegiance with Lord Voldemort, however Ron and Hermione are doubtful with the lack of evidence . Harry wears his invisibility cloak and hides in the same carriage that Malfoy is seated in . He overhears Draco bragging to his friends about the mission Lord Voldemort has tasked him . However, Malfoy is suspicious that someone else is in the carriage and discovers Harry Potter was listening to his conversation . He petrifies him and breaks his nose out of rage . Harry cannot get off the carriage, and is worried the Hogwarts Express will depart before he can move again . To his relief however, Nymphadora Tonks finds Harry and escorts him back to the castle during the opening feast . </P> <P> The students return to school, where Dumbledore announces that Snape will be teaching Defence Against the Dark Arts . In the meantime, Horace Slughorn will resume his previous post as Potions teacher . Harry now excels in Potions, thanks to having received a used Potions textbook that once belonged to someone named "The Half - Blood Prince," a mysterious former student who wrote numerous tips and spells in his Potions textbook . Harry uses this information to achieve superb results . After a class contest, The Half - Blood Prince's tips help Harry win a bottle of Felix Felicis, more commonly known as "Liquid Luck ." Though Harry's success pleases Slughorn, his newfound brilliance in potions angers Hermione, who feels he is not truly earning his grades and also does not trust the Half - Blood Prince . </P> <P> Believing that Harry needs to learn Voldemort's past to gain advantage in a foretold battle, Dumbledore schedules regular meetings with Harry in his office . Amidst these lessons, Ron starts dating a girl named Lavender Brown, who is also a sixth year Gryffindor student, and Ron and Hermione start yet another quarrel . Also during this time, Dumbledore and Harry use Dumbledore's Pensieve to look at the memories of those who have had direct contact with Voldemort . Harry learns about Voldemort's family and his foe's evolution into a murderer, obsessed not only with power, but with gaining eternal life . Dumbledore shows Harry a memory involving Slughorn conversing with the young Tom Riddle at Hogwarts, which has clearly been tampered with . He sets Harry the task of convincing Slughorn to give him the true memory so that Dumbledore can confirm his suspicions about Voldemort's rise to power and near - invincibility . This is proven vital in the defeat of Voldemort . </P>

Where did harry get the half blood prince book
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