A devious troublemaker has emerged off the coast by Griffonstone, threatening the peace of the citizens who live there. But when the Cutie Map chooses only Twilight to go and resolve the issue, this leaves Starlight and Rainbow Dash gravely worried. What could the map possibly be trying to say, and why did it feel the need to send Twilight all alone despite having friends there who could support her? Though the map does what it always has, Starlight and Rainbow Dash still don't like it one bit, prompting a rebellious action. Who is this devious troublemaker, and what connection does she have to Twilight?