Twilight, Spike, and Cadance go on a trip to the town of Rogueport, and everything seems fine. However, when Cadance goes missing, chaos happens, whisking Twilight into what might be the return of an old foe...
(Based off Paper Mario: The Thousand-Year Door, if you haven't guessed. I'd like to note that the plot is different, so take a read. You might be surprised. This isn't a complete carbon copy. Chronologically takes place before Keep Calm and Flutter On but after A Canterlot Wedding.)