A strange book written in a script not linked to any known language is given to Moon Dancer by a mysterious stallion with dark spectacles and a charming smile. Wary of what lay within yet curious nonetheless, Moon Dancer enlists the aid of her old friend Twilight Sparkle in deciphering the script and unlocking the truth behind the book's origins.

What follows is a detailed account of the endeavor and its tragic and terrifying conclusion, penned by the broken mare who survived to tell the tale.