Twilight Sparkle receives a note from the royal guard stating that Princess Celestia wants her presence back at Canterlot Castle. In fact, Celestia doesn't want her back to discuss matters concerning Equestria or the ruling of it. She has a special lesson planned for Twilight that she forgot to teach many years ago when Twilight was still growing up. Now that she's remembered, she will be sure to pass on the important knowledge. However, Twilight Sparkle will have to learn that not all knowledge is retained through the mind.