 This sparks the rumour mill yet again , as students around the school suspect Harry of being the Heir of Slytherin , and circumstantial evidence to support this theory arrives in the form of another attack , this time on Hufflepuff second @-@ year Justin Finch <unk> 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 . 
