When a mysterious new mare moves into Ponyville the town quickly turns to panic when the local foals begin to go missing, walking away from their homes in the dead of night and appearing days later. They return home dazed and ill, without any recollection of where they went or why. Twilight begins to investigate the foals and where they could go, when the mare begins to appear more mysterious as the investigation goes on Twilight begins to make connections. Does this new mare have any connection to the foals vanishing acts or is Twilight just paranoid about the new mare.