This story is a sequel to Cider with an Interesting Stranger
On one hand you have Lightning Dust, a Wonderbolt washout who's finally gotten over her failures. She's living out a pretty normal life in her own personal private sector. Now she finds herself called upon to jump back into the fray for a friend.
Then we have Flash Sentry, a royal guard pony who somehow has managed to miss out on a lot of the big events. His heart's always been in the right place but he's never been able to show where he truly fits. Not until a situation arises where a particular set of skills could make all the difference does he receive an opportunity to show what he can do.
Finally, there's the trio of Goldcap, Decepticolt, and Zappityhoof. The three have already crossed the Princess of Friendship and now find themselves in a tight spot. Their new plan for power and glory may yet hit another hiccup as what starts off as a simple in and out job turns into a run for their lives.
A bit of a continuation to Friends Forever #25.