Following the events of "Three's a Crowd," Cadence tells Shining Armor about her time with Twilight and Discord over a crystal mud bath with her husband.
In this sequel to "Defender of Equestria," a Changeling General goes on trial in Canterlot for numerous war crimes, including kidnapping Cadence and Twilight, while Shining Armor's mentor and predecessor attempts to make amends with Celestia and Luna