Royal Detective Marnie Nightingale, a unicorn mare, leads a great life. She's a prodigal detective, working her flank off to protect the public, sometimes going undercover to bust the bad guys. However, after a tragic accident which nearly costs Nightingale her life, she finds herself in the present day... or future, from her perspective.

And then she finds out the mafia she was trying to defeat is still around.

And then the police chief is corrupt.

Can she manage to expose the chief and save Equestria from the iron hoof of the mob?