Harry got back to live with the Dursleys after the ending of the first year at Hogwarts. Of course he was often sneered by Dudley, and worked like a servant at ‘home’. One day, a house-elf came and told Harry not to go back to Hogwarts again, because there was someone plotting to kill Harry at Hogwarts. But Harry wouldn’t agree so Dobby ruined the Dursley’s appointment with a big client who will help him got promotion and impute this to Harry. So Harry was locked and never allowed to go back to Hogwarts. But Ron and his elder brothers drove their father’s fly-car and took Harry to their house. And also they flew to Hogwarts together.
At Hogwarts, there was obviously something unusual happening. Some Muggle-born students were attacked. Everyone felt scared and one day, Ron’s younger sister, Ginny was disappeared and someone wrote that Ginny would be killed by the heir of the Slytherin. Under this circumstance, Harry and Ron found the chamber of the secrets at last(now Hermione has been Petrified too), they got into the chamber and found that it was the memory of Tom Marvolo Riddle who actually was later to become Lord Voldemort rigging all these things. At last, Harry saved Ginny and Riddle was wiped out. He and Ron won 200 points apiece for Gryffindor and assured the leader in the House Cup.