A mysterious horse has done what nopony else has ever dared to do: separated the Flim Flam Brothers. With Flam missing, Flim doesn't know what do do wihout his brother's help. So he turns to the second-most reliable pony he knows: Applejack
Twilight Sparkle is called away to tend to Luna when she falls ill. As Luna grows sicker and Twilight more determined to help the younger princess, she begins to uncover dark secrets about the elements, the alicorns, and her own past.