As the thousandth Summer Solstice Celebration approaches, Twilight Sparkle discovers a prophecy about The Mares in the Moon, whom The Princess banished long ago.
It's the first Hearth's Warming since Twilight and Rainbow Dash started dating, but that doesn't worry Dash. She should have no problem getting the perfect gift for her marefriend.
Calligraphy, a unicorn scholar, is informed of a strange book in an ancient language. He and his colleagues embark on a quest to discover its secrets... secrets that are buried perplexingly deep.
Rainbow Dash would rather do anything else than sit in an office and discuss problems she didn't have. Yet here she was, waiting for it to be over. Her only real hope was that Applejack would come to her senses before the next appointment.