Chamber of Secrets is much darker than Philosopher's Stone. I like it more because of this. Harry is very much an outcast in this one and has been dealing with a lot of unexplainable events. First, a house elf shows up and warns Harry. Then, he and Ron are unable to get through Platform 9 3/4 to go to Hogwarts. The Whomping Willow tries to murder both of them once the flying car they arrive in smashes into it. During his detention from arriving in the flying car, he starts hearing a voice moving through the wall, a voice only he can hear. Finally, Harry reveals that he is a Parseltongue during Dueling Club at school and now everyone thinks that he is the heir of Slytherin and the one who has opened the Chamber of Secrets, which holds home to a monster that either petrifies or kills its victims. The monster within the Chamber must be destroyed and who is better to kill it than Harry Potter himself?
My favorite scene in this film is when he discovers how Tom Riddle's diary works. I love how the diary writes back to him and how it takes him back 50 years ago to a memory that frames Hagrid as the heir of Slytherin. It's frightening how easy it was for Tom Riddle to gain Harry's trust. I also love when Harry realizes that Tom Riddle is Voldemort, slaughters the basilisk with Gryffindor's sword, and destroys Tom Riddle with one of the basilisk's fangs. I've been wondering though, if Harry hadn't destroyed the diary, does that mean that Voldemort would have come back as his 16 year old self? That would have been weird!