Twilight and Luna set out to dig up some old records in the Castle of the Royal Pony Sisters. As they are doing this a plot by Chrysalis, hinging on the two alicorns being out of her way, begins to move on Canterlot through unexpected means. Will the two alicorns even realize there is trouble in time and even if they do, can they get to Canterlot in time to save it? The Princesses might even have bigger issues besides. One has a crush on the other and the one being crushed on is probably the most romantically oblivious pony to have ever existed.