A Harry Potter Adventure

As you turn down the covers of your four-poster, you see a leatherbound book and a note laying on your pillow.

"Harry," the note reads, "I sent this journal to you for your birthday, but it was returned to me the following day which raises my suspisions about who may be intercepting messages sent through the owl post. At least I was lucky enough to have the package returned. The sick Phoenix I've been caring for doesn't seem to be recovering very well. I tried letting her out of the cage from behind my hut, and she is having some trouble flying. Hopefully Dumbledore will have a solution. Anyway, I bought this journal one day while shopping through Knockturn Alley. I know it's not much. The storekeeper says it's supposed to be a magic journal, although I can't figure out what's so magic about it. I figured I'd leave that part up to you. I've never been very good at figurin' stuff out. I hope you like it, Harry, and I'm sorry you are getting it so late.
Your friend,
Hagrid"
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The journal is absolutely amazing! The engraving on the cover reads "Harry Potter." This journal would be great for recording your thoughts and dreams. It may even be good for jotting down some spells too. But you notice that Hagrid has purchased it from a store in Knockturn Alley. That is the shadiest place you've ever been to. Nothing good could come from there.