Summer vacation ends, and he eagerly awaits returning to study. However, it comes a House Elf Dobby, and advises Harry not yet returning to school, because according to him, the boy there will be face great danger. But neither the hero drew attention to his words, and as it is peculiar to children, does everything with turnover in accuracy. At this time the school comes a series of mysterious accidents. Immediately upon arrival at Hogwarts, Harry, along with his friends Ron and Hermione learn of the existence of a Secret room, and then they decide, that has not been around to look for the same room.