This was a bit rushed and could honestly use some polishing. There were some grammatical errors and the characters were a bit...I don't know...OOC? Anyway, I think you have a great concept here - a letter starting everything. It would have been interesting to see it as a chapter fic! Keep writing. :)
Thanks, the problem with me submiting more stories is that they keep getting rejected and I don't think the version of 'The Letter' here is even the improved version that I have in my account on harrypotterfanfiction.com because everytime I tried to change it went all wrong.