"Of course, I could leave nothing to chance. But when the diary didn’t show up at Hogwarts, I had to create another test for Harry that year, and when Harry’s name wasn’t thrown out of the goblet I knew something was wrong. And when I couldn’t find Peter at the end of Harry’s fourth year, I realised something went wrong somewhere since Voldemort did not come back as I had anticipated. I have been trying to find out what went wrong."