A few weeks later, Hagrid wins a dragon egg in a poker game.Because it is illegal to own dragons, Harry, Ron, and Hermione contact Ron’s older brother, who studies dragons.Malfoy doesn’t show up at the appointed place, and Harry almost gets in trouble.
Unwittingly, they lock the troll in the girls’ bathroom along with Hermione. Hermione tells a lie to protect Harry and Ron from being punished.
During Harry’s first Quidditch match, his broom jerks out of control.
Hermione notices Snape staring at Harry and muttering a curse.
She concludes that he is jinxing Harry’s broom, and she sets Snape’s clothes on fire.
He discovers the Mirror of Erised, which displays the deepest desire of whoever looks in it. After Christmas, Harry, Ron, and Hermione begin to unravel the mysterious connection between a break-in at Gringotts and the three-headed guard dog.