Although Ron firmly believed that the diary Harry had picked up was just an ordinary discarded notebook, Harry felt that there might be some secrets hidden inside this journal, which originally belonged to Tom Riddle.
Both the timing and the manner of its appearance felt wrong to Harry. Furthermore, the fact that it happened to be a diary from fifty years ago made it hard not to connect the book to the events of the Chamber of Secrets half a century ago.
The next day, during the lunch break, Harry, Ron, and Hermione made a trip to the Trophy Room on the fourth floor of the Castle.
Chapter 559