Princess Cadence always feels threatened by Princess Luna. They've only known each other for only half a year, and Cadence can never find the ground to stand up to such a brute in her own home. But, when Luna's emotions start to get too hard to cover up, Cadence might discover something else underneath that hard exterior that is the returned princess of the night.

When Percy Jackson and Nico di Angelo have been attacked and have woken in Equestria with little knowledge how, Princess Twilight Sparkle vows to help them get home. Princess Celestia instructs them to find a magic staff in a place called Akritai in the world beyond the mirror. When Twilight and her new friends cross through, more challenges await them, and more mysteries to solve.