Twilight Sparkle starts getting weird letters addressed to T.S- Obviously Twilight Sparkle. But aren't Tempest's initials the same? A series of amazing discoveries, from newfound sisters, to Tempest's cutie mark, they discover that there might be more to the letters then it seems.

BTW, I found the empty scroll online, and edited it, adding the 'Dear T.S' and writing lines. So cover art partially owned by me.