Rockhoof has returned to Equestria after a thousand years in Limbo. He's also severely depressed. Princess Luna pays him a visit in his lonely dream to find out what troubles him.
Mister Lonely Heart is a changeling "Grievance Councelor", who imitates ponies that his clients have problems with. Applejack wants to say a few choice words to a relative. A dead relative.
Mister Lonely Heart is a self-styled "Grievance Counselor", a changeling who mimics ponies that his clients have issues with. When Twilight Sparkle pays him a visit, he finds out how painfully neurotic the Princess of Friendship really is.
Nopony should bottle up their feelings. Sometimes, all a pony needs to do is talk with their friends. Sometimes, all a pony needs to do is pretend someone's listening. So, Diamond Tiara hides in her room, writing away her troubles with letters.
A young Celestia and Luna venture into the Whitetail Wood in pursuit of the Star Eater, a monstrous magic-eating dragon. The cost of victory is greater than either could have expected.
Luna was never banished, Discord is Celestia's court jester, the Elements of Harmony do not exist, and Twilight grows more pompous and more egotistical every day. Celestia is not amused.
Life could not be better for Celestia. She had the love of her life, and now she had a beautiful child. But not all is as it seems... A prophesy a thousand years in the making, threatens to drive Celestia mad….