Harry's Trunk is Ransacked, and Riddle's Diary is Stolen

After a Quidditch practice, Harry returns to his dormitory to find his trunk ransacked. With help from Ron and Neville, Harry realizes that Tom Riddle's diary is missing. The group discusses the implications of the theft and the fact that only a Gryffindor could have stolen it, as no one else knows the password to Gryffindor Tower.