Bon Bon has been not entirely truthful over the years with her "Best Friend" Lyra, who finally she demands she come completely clean. Some of the secrets aired are mundane at best. But others? Well, you'll just have to read the story, won't you?
Lyra and Bon Bon have a somewhat unusual relationship. One of them is a secret agent. One of them is a changeling. And the third one is a perfectly normal pony about to have her life turned upside down.
A few months prior, Starlight Glimmer drank a potion which showed the tragic demise of one of the worlds she affected when she sabotoged the first Rainboom. Now, she must undo the damage she's caused before it can get any worse.
Starlight and Twilight drink a potion which reveals the downward spiral one of Starlight's alternate universes took. Meanwhile, Twilight watches Starlight take a downward spiral of her own.
Chrysalis has been fired as Changeling Queen, but now the Changeling Hivemind must do something even harder than attack a shielded Canterlot filled with the weaponized love of its inhabitants: hire a new queen.
Lyra is not everything she claims to be. When she tries to leave town in secret, Bonbon follows to find out the truth, even if it takes them to the end of the world.