Desiring to make a difference in the world, a mare who was once an unassuming musician joins the Equestrian Spy Service and becomes an operative specializing in infiltrating high-class society and taking down high-class targets. Never in her life, though, did she think she'd witness the rise of a superhero.  No less having one work with her.  

A Friend-Shipping action/adventure story.  

Contains some violence, but nothing more graphic than somepony knocking another unconscious.