Betwixt

A plot is afoot in Canterlot to usurp Celestia's benign rule, and Shining Armour is embroiled in trying to uncover it, before Equestria loses its princess.

In the height of tension following anti dragon feeling in Canterlot, Shining Armour finds the city is not a peaceful as it once was. Celestia is growing weaker by the day, and, if he's not quick, may end up not being in power for much longer.