Princess Celestia sends Twilight a letter asking her to come to Canterlot ASAP. She explains that an important matter has arisen. Discord isn't back, and Luna hasn't slipped back into Nightmare Moon, so what could possibly be so important?

What does Celestia know that Princess Luna doesn't? And why did she sign the letter 'Love'?

During her stay in Canterlot, Twilight discovers the truth about her life.

Chapter 2 is on the way, sorry if the story seems short now. I couldn't get a proofreader since everybody/everypony (sheesh) is really busy, so please point out the dozens of grammatical and spelling mistakes. There's bound to be some holes in the plot, so point those out too.