Sombra and Luna are settled in the Castle of the Two Sisters and Celestia, mistrustful of her former enemy's motives has allied herself with Twilight preparing for the worst. Then, one morning the moon won't set ...
Celestia fears she is losing her sister and worries how to defend Equestria should Sombra and Nightmare Moon combine forces. She needs to build an alliance and one pony comes to mind above all others, but does her longing for Twilight run deeper?