This story is a sequel to Sunset's Hearth's Warming

As a crime wave comes to Ponyville, Rainbow Dash meets up with an old friend from her flight school days. However, she learns that certain events have caused him to take on an outfit and lifestyle inspired by the Mysterious Mare Do Well. One of the scary things she learns is that it's all that's keeping him alive. Determined, Rainbow Dash tries to help him, and maybe help put a stop to the crime wave in Ponyville. Will she succeed?

Follows in between MLP FIM Season 6 Episode 12 and Season 6 Episode 13.
Previous Volumes That come before this story:
Novel No 1: Sunset's Redemption
Novel No 2: Sweetie Belle's Big Adventure
Novel No 3: Sunset's Hearth's Warming

(Reason why this is Rated T is for this story gets dark in later chapters)