It was an ordinary day in Ponyville. Phillies and colts were at school; mares and stallions were at their work, and nothing seemed out of place. Even so, Twilight Sparkle couldn't help but feel like something BIG would happen that day.
Twilight was in the library, re-shelving some books that had just been turned in, when Spike came running in and knocked her over, making her drop all the books that she had been levitating.
"Spike!' Twilight scolded as she picked herself up. "What in the hay did you do that for?"
"Sorry, Twilight," Spike replied sheepishly. "It's just that Princess Celestia just sent this for you." He held up an un-opened scroll. "It's marked as 'urgent'"
"Why didn't you just say so!"
"I just wanted to get it to you faster." Spike grumbled as Twilight levitated the scroll out of his hand.
"Dear Twilight," She read aloud.
"I would appreciate it if you would come to Canterlot as soon as possible. Princess Luna and I have made an incredible discovery, and we need you to follow up on it. Before you ask, we need you to do it, because your knowledge of what this discovery concerns far exceeds our own.
Your teacher,
Princess Celestia"
Twilight hastily packed a saddle bag and ran out the door to head to the train station. On the way, Twilight bumped into Rarity- literally!
"Oof!" She exclaimed. "Twilight, what in Equestria are you in such a hurry for?"
"Sorry, Rarity," Twilight replied. "The princess has summoned me to Canterlot. I'm on my way to the train station."
"Oh, are you taking another test?"
"I don't know. Princess Celestia was surprisingly vague in her letter. If it turns out that the fate of Equestria is hanging in the balance –oddly enough, that's what most of the times I'm summoned to Canterlot lead to, anyway- I'll let you and the others know."
"Alright. I'll keep an eye on things at the library while you're away."
"Thanks, Rarity!"
"It's no problem. Now, go on; Princess Celestia is waiting."
"Right. I'll see you soon!" Twilight continued on, and barely caught the next train to Canterlot.