Fluttershy's pleasant dream is transfigured into a horrible nightmare, and nopony sees her the next day. A book about dream magic is stolen from Twilight's house. One of the Mysterious Mare Do Well costumes Rarity kept goes missing. The hot-air balloon has been taken. All of this in a single night, and it all revolves around one mysterious pony who then breaks into the Canterlot Library. What is happening? Why is this pony doing all of it under the cover of darkness? Whatever the reason, Twilight Sparkle is determined to find out.

Author's Note: Story is written based on a format as if it is the script of an actual episode, which is why the story arc is two parts that take approximately 22 minutes to read. and an epilogue to set up for the soon-to-come sequel, Necessary Corruption.