 Writing after all seven books had been published , Graeme Davis regarded Harry Potter and the Chamber of Secrets as the weakest of the series , and agreed that the plot structure is much the same as in Harry Potter and the Philosopher 's Stone . He described Fawkes 's appearance to arm Harry and then to heal him as a deus ex machina : he said that the book does not explain how Fawkes knew where to find Harry ; and Fawkes 's timing had to be very precise , as arriving earlier would probably have prevented the battle with the basilisk , while arriving later would have been fatal to Harry and Ginny . 
