Louis' presence may be gone but his secrets still remain untold.
After leaving Harry a suicide note he also leaves 31 letters. One for each day of March.
As each day goes past Harry soon realises how truly sad Louis was. Obviously there's no bringing him back but he can make things right.. maybe.
Dear Harry.
If you're reading this I guess the time has come. I had been planning this for a while, too long to be precise.
I held many secrets, Harry. Too many to mentally hold, that's where it all started.
But we're not going into details just yet.