<P> This sparks rumours yet again, as students around the school suspect Harry of being the Heir of Slytherin (as Slytherin was also a parselmouth), and circumstantial evidence to support this theory arrives in the form of another attack, this time on Hufflepuff second - year Justin Finch Fletchley and the Gryffindor ghost . Harry, Ron, and Hermione begin to suspect that Draco is behind the attacks, given his family history of remaining well within Slytherin ranks and open hostility toward Muggle - born students, and so Hermione concocts Polyjuice potion, which allows them to become Draco's boorish lackeys, Vincent Crabbe and Gregory Goyle, for an hour to interrogate him . This comes to nothing, as Draco's father only told his son the general facts of the previous opening of the Chamber and that it occurred fifty years previously . Meanwhile, Myrtle Warren, an existentially mopey ghost that haunts a bathroom, unwittingly provides a new clue in the form of a diary deposited in her stall--a diary, moreover, that belonged to Tom Riddle, a student who knows all too well about the Chamber, having been witness to a fellow student's death fifty years ago . The culprit, he reveals to Harry, was none other than Rubeus Hagrid, now gamekeeper for Hogwarts School; when Hermione is attacked next, alongside a Ravenclaw prefect, the school is put on lockdown, and Dumbledore and Hagrid are forced to leave the premises . </P> <P> Fortunately for Harry and Ron, Hagrid left a set of instructions: to follow the spiders currently fleeing into the Forbidden Forest, which they do, only to find the monster blamed for the attacks fifty years before, a massive spider named Aragog, who explains to the duo that the real monster is one that spiders fear above all others . Hermione provides the last set of clues that inform them of the monster's identity: It is a basilisk, (hence Harry's ability to understand it,) that kills with a stare (although no one is dead because of various devices through which they indirectly saw the monster) and which spiders (such as Aragog and his offspring) fear above all others . Harry figures out from hints Aragog dropped that a student who died during the previous attacks is Myrtle, and when Ginny is apparently taken by the monster into the Chamber, they discover that the entrance is in the bathroom they have been using to make Polyjuice Potion . Harry, Ron, and Lockhart enter the Chamber, but the dunderheaded professor (who reveals that he is a fraud) causes a rockfall while attempting to modify the boys' memories with Ron's damaged wand . </P> <P> Separated from Ron, Harry enters the Chamber of Secrets alone to find an unconscious Ginny and Tom Riddle who claims to be a memory preserved in his diary for the last fifty years . Tom Riddle shows Harry that his full name, Tom Marvolo Riddle, can be made into the anagram "I am Lord Voldemort ." Tom Riddle is in fact Voldemort's true name and it was he who opened the Chamber fifty years before and framed Hagrid as Riddle is the true Heir of Slytherin . By possessing Ginny through his diary, Riddle has been continuing what he started fifty years before . Harry's loyalty to Dumbledore in the face of Riddle summons Dumbledore's phoenix, Fawkes, who arrives with the Sorting Hat . Fawkes blinds the basilisk, allowing Harry to remove the Sword of Godric Gryffindor from the Sorting Hat and slay the creature . Though fatally poisoned by the basilisk, Fawkes saves Harry who uses a basilisk fang to stab Riddle's diary . Both the diary and Riddle are destroyed and Ginny is restored . </P> <P> Harry, Ron, Ginny, and Lockhart return to the main castle and reunite with McGonagall, Dumbledore, and Mr. and Mrs. Weasley . Ginny, whose possession by Voldemort caused all of the petrification and troubles over the course of the year, is given a reprieve by Dumbledore, who reasons that greater wizards have been duped by Voldemort before and takes great interest in the qualities of the diary, which Harry gives to him . Lucius Malfoy bursts in after this meeting, demanding to know why and how Dumbledore has returned to the school and accompanied by Dobby, revealing the family to whom he is enslaved . The house - elf also provides Harry with unspoken cues regarding the diary's ownership: While it was Tom Riddle's, it had been in the Malfoys' possession . While in Diagon Alley over the summer, Lucius, a follower of Voldemort, had slipped the diary into Ginny's cauldron to ensure the reopening of the Chamber of Secrets . Harry returns the diary, devising a scenario involving his own sock that frees Dobby from the Malfoys' employment, hence provoking an attack on Harry, only for Dobby to jump in and save him . The petrified students are cured, the end - of - year exams are cancelled (much to Hermione's chagrin), Hagrid comes back in the middle of the final feast, and Harry returns to Privet Drive in higher spirits than he last left it . </P>

What is the plot of the chamber of secrets