Oasis and Apollo, quarter dragon siblings, have noticed their father, Turquoise Blitz, acting strangely since the anniversary of their mother's death, so when he returns from a trip to see his sister with a new necklace and an announcement that he will be spending more time in Canterlot, their suspicions are piqued. What will they do when they find that Princess Nidra may be out to replace their mother?
Turquoise Blitz and Anthea are finally getting married, but Princess Nidra isn't too happy about it. When she attempts to bring about slumber eternal, her mother, Princess Luna, intervenes.
It's been a long time since Princess Nidra and Anthea fought over the affections of the dragon-pony, Turquoise. Since then they have been through much and become good friends. Now, an aging Anthea has one last request of her friend.
Turquoise Blitz's children learn that, after years of mourning his late wife, Anthea, their father may be moving on, but how will Oasis and Apollo take having Princess Nidra as their stepmother?