There's been another sighting of the mysterious Mare Do Well...but this time, all of Rainbow Dash's friends plead ignorance, insisting that they've put aside their costumes for good. Rainbow Dash is determined to uncover the masked mare's true identity before she's humiliated yet again, but this time around, the vigilante seems especially interested in her as well. Will Rainbow Dash be able to solve the mystery before the culprit takes the hoax too far? Or is she in danger of losing not only her mind, but her heart?

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