When the body of a young mare turns up on the shore of One-Eyed Lake wrapped in plastic, Twilight Sparkle and Sheriff Millard "Applejack" Fillmore take the case and set out to apprehend the murderer. But as they are about are about to discover (over a damn fine cup of tea and a killer piece of apple pie), nothing in the young, quiet town of Pony Peaks is ever as it seems...