Whether you're the Great and Powerful Trixie, or the overstressed former student of Equestria's premier Princess (and now a Princess yourself!), sometimes a pony just needs a little "me" time. Quite by accident, Twilight Sparkle discovers there is another pony (and one she knows quite well, too) that shares her own particular method of "stress relief".

So, just how does a usually shy (and often socially-inept) pony Princess introduce herself to a former rival as a potential friend, and confidant, regarding their shared love of being bound and gagged?

Having survived a somewhat rocky start, the two gradually come to know each other better, and, as their relationship develops, Twilight learns that there is much more to the magician than anypony thought. But knowledge can be a two-edged sword, and as Twilight learns more about her friend, unknown --and deadly-- forces begin to stir . . .

. . . forces that will change Equestria forever . . . if it doesn't destroy it first.