Harry Potter and the Chamber of Secrets is the second in a planned series of seven books (see annotation of Harry Potter and the Sorcerer's Stone for an introductory summary). Harry's summer with the Dursley family is initially more pleasant because the Dursleys are afraid of Harry's wizard powers and do not realize that he is forbidden to use magic outside of school. However, after a magic spell is performed by a visiting, self-flagellating house-elf, Dobby, Uncle Vernon is informed of this school rule and imprisons Harry in his bedroom.

With this maneuver and others, Dobby tries to not only warn Harry that his life is in danger but also prevent Harry from returning to Hogwarts. Barred and sealed in his room, Harry is forced to live off meager portions of soup, which he shares with his owl, Hedwig, until he is rescued by several of the Weasley boys.

Though Harry (now age 12) and Ron miss the train to Hogwarts, they manage to arrive, meet the Whomping Willow (a violent magical tree that beats anything near it), and are nearly expelled by the strict but kind-hearted Transfiguration Professor Minerva McGonagall, head of Gryffindor House. Many of the students, teachers, assorted creatures and magical items (e.g., the invisibility cloak) return in this book, and again a dangerous adventure features Harry, Ron, and their brainy friend, Hermione.

Ron's younger sister, Ginny, is now an impressionable Gryffindor first year student. The adventure leads Harry to the past, a young but evil Voldemort, and more encounters with snakes, Snape, spiders, the Malfoys, and Moaning Myrtle, the ghost of the girls' bathroom.

Illness, particularly an altered, petrified state, plays a prominent role in this book, requiring the healing powers of Madame Pomfrey and the maturing of mandrakes nurtured by Herbology Professor Sprout. Famed author and narcissist Gilderoy Lockhart, the new Defense Against the Dark Arts teacher, muffs the healing of Harry's broken arm, a Quidditch injury, and Harry must go to Madame Pomfrey in the hospital wing for the proper, though painful treatment. Madame Pomfrey is also helpful with a Polyjuice potion gone awry--the potion is supposed to transform the drinker into another person for an hour.

Fawkes, Dumbledore's phoenix, whose flaming death and rebirth is witnessed by Harry, helps in numerous ways, including the healing powers of its tears. But perhaps, as in the first book, Dumbledore's concern and wisdom are most soothing for Harry. Harry, worried about his strange capabilities that link him with Voldemort, such as their shared ability to talk with snakes (Parseltongue), and that the Sorting hat considered placing Harry in Slytherin House and only put him in Gryffindor due to Harry's request, is reassured by Dumbledore that Gryffindor was the right choice: "It is our choices, Harry, that show what we truly are, far more than our abilities." (p 333)