Dethroning the Prince

Twilight ducked behind a display for what felt like the thousandth time, heart hammering in her ears. She gulped 'Okay, just one more corner to go. Just one.
Three, two…' A squeak on the floor as her hoof slipped made her gasp. 'No! Go away! Horseapples!' The Unicorn ceased to breathe as she stared frozen, wide-eyed at the guard as his gaze slid across the room and fixed on the spot where she hid.
He called out and moved towards her with his spear held ready.
She panicked and teleported to the feather, grabbed it with her magic and set all the alarms off. With her heartbeat pounding in her ears, she lit up her horn and went back to her library for what was sure to be her last time.
~~~
When the Royal Sisters go missing leaving nothing more than a bloodied blue feather, Equestria's throne goes to the next in line, Prince Blueblood.
With Equestria spiraling down into dark times and war with the griffons looming on the horizon it seems that there are enemies everywhere for Blueblood.
Twilight, once Princess Celestia's favoured student, now outlaw to Equestria is determined to find the princesses, no matter the consequences. But those consequences might not be the ones she was expecting.
*Canon up until Magical Mystery Cure