There is a plot. A plot for bad things to happen.
Harry Potter cannot go back to Hogwarts School of Witchcraft and Wizardry this year. Harry Potter must stay home.
The Chamber of Secrets has been Opened. Enemies of the Heir Beware.
Its written in blood !
Mrs Norris has been petrified. I demand caution. To everyone.
Harry Potter must leave Hogwarts! Dobby thought that if he closed the portal, Harry Potter wouldn't be able to go to school! Harry Potter must go back! Now that history is to repeat itself!
Harry Potter sits in his bedroom, pretending he doesn't exist. The Dursley family have guests over, so Harry must stay very quiet. A house elf named Dobby appears out of nowhere and warns Harry, that he musn't go back to Hogwarts School of Witchcraft and Wizardry this year.
This is out of my hands, Potter.
I didn't do it Professor, I swear.
A message on the wall of Hogwarts. Said to be written by a monster that lies within the Chamber of Secrets. Mrs Norris, Mr Filch's cat, was also petrified. She most likely saw this monster.
Her Skeleton will lie in the chamber forever
The heir of Slytherin has left another message. Our worst fear has been realized. This is the end of Hogwarts. Send all the students home..
After breaking his arm, Harry gets a visit from Dobby once again. He repeatedly warns Harry, tells him to go back home. Back to the Dursleys. Harry disagrees. Dobby cannot say who or what is plotting this. Or what is going on and who the heir of Slytherin is.
Harry walks in on yet another petrified student. This time though, one of the school ghosts was also petrified, Nearly Headless Nick. After seeing this, Professor McGonagall, takes Harry to see Professor Dumbledore. All of the teachers are worried.
One last message, but this time, a student has been taken by the monster into the chamber itself. Ginny Weasley. Professor McGonagall, Professor Snape, Professor Lockhart, and Madam Pomfrey gather. They decide to send all the students home.
Harry decides to take on the monster by himself. This giant snake called a Basilisk is stabbed in the eye by Harry carrying the sword of Godric Griffindor. With the help of Fawkes the Phoenix, Harry is able to defeat the Basilisk and Tom Riddle. He saves Ginny and destroys Tom's Diary which has been controlling Ginny.