Applejack, Big Mac, and Applebloom wake up to find that their grandmother, Granny Smith, has passed away. Everypony is sure that her death is merely the result of natural causes, of her age finally catching up with her. But Applejack gets the feeling that something isn't right about her grandmother's death, and she enlists the help of Pinkie Pie and Rarity to investigate.

Will her friends be able to solve this mystery? Is there even a mystery there at all?