Harry Potter (Daniel Radcliffe) has finished his vacation and is returning to Hogwarts to continue studying magic. A house-elf named Dobby warned Harry not to return to Hogwarts or he would be in great danger. Harry ignored Dobby's advice and returned to Hogwarts. Soon, a series of strange things happened at Hogwarts: students were petrified one after another, but the reason could not be found. Harry could always hear a strange sound coming from the wall. Legend has it that there is a secret room in Hogwarts that records the secrets of Voldemort's youth. Only Slytherin can open the secret room. Harry accidentally discovered that he could understand snakes, and there was a rumor that Harry opened the secret chamber. Is the danger Dobby referred to hidden in the secret room?