Twilight receives a letter out of the blue that reveals a secret she's been keeping from her friends, a letter that conveys the condolences of a family friend. What hidden meaning does it carry, and how will Twilight deal with the responsibility that comes with it?

After Twilight's grim duty is completed, the mane 6 travel out of the country on a diplomatic mission to the Griffon territories and find trouble on the way.

(If there are grammatical or other errors, please tell me in the comments and I'll fix them)