Harry escaped from the menstruating house by himself. In the middle of the night, he was walking alone in the street when he suddenly saw a terrible black dog. Fortunately, a knight bus from the magical world arrived in time, rescued Harry and took him to London. Harry had a happy time in London. He not only saw many strange magic objects, but also finished his own paper. Strangely, he also met a book called "Death Signs", the cover of which was the black dog he saw the night he left his menstrual home. A sense of foreboding made Harry feel that something terrible would happen.
At the end of the summer vacation, Harry also met his two good friends Hermione and Ron in London. Harry learned a terrible thing from them. Sirius, the villain who is said to have betrayed his parents, escaped from Azkaban, and his purpose is probably to continue to hurt Harry.
Harry was not afraid when he heard that Sirius was going to hurt himself. On his way back to Hogwarts School of Witchcraft and Wizardry, he met dementors, a monster that really gave him the creeps. It was sent by Azkaban prison to catch Sirius. Fortunately, the new magic teacher Professor Lu Ping saved Harry.
The school of witchcraft and wizardry has started again, and many new students have come. Harry also went back to his classmates and friends. The new teacher's new curriculum has made his life fresh and exciting. The new magic teacher Lu Bang's class is very interesting, but the prediction class makes Harry feel even more afraid. Snape is still against him as before. Interestingly, Hagrid also became a teacher and taught them to keep some strange animals. One day, Hagrid taught them to get close to Buckbeak (a huge, fierce and grumpy Gryphon), and Malfoy angered him, so Buckbeak kicked Malfoy.
Malfoy, who was wounded by Buckbeak, immediately reported Hagrid to the Ministry of Magic. He wanted to disqualify Hagrid from teaching and execute Buckbeak the Gryphon. On the day Buckbeak was executed, Harry, Hermione and Ron came to Hagrid's cabin. They want to comfort Hagrid. Unexpectedly, instead of finding Hagrid in the hut, they found a mysterious black dog and Ron's pet mouse.
Harry and the three of them curiously followed the black dog and Scabber and found that they got into a hidden cave, so they climbed in. After climbing a dark road, Harry and others came to a small house. They were suddenly startled: in the room, a unkempt man was fighting with a dwarf and Professor Snape. Professor Snape told Harry that the unkempt man was Sirius who killed Harry's parents.
Seeing the enemy who killed his parents, Harry waved his wand angrily and pointed it at Sirius. At this critical moment, a man suddenly rushed into the room and knocked Harry to the ground. This man is a magic teacher, Professor Lu Bang. It turns out that Sirius is not the one who killed Harry's parents. In fact, the real killers are Wormtail and Voldemort.