This story is a sequel to The Legendary Knights of Friendship

Strange yet unusual activity happening in Canterlot Town and the City. Mane Seven, Cutie Mark Crusaders and Dragon Strike Force of Human Realm must deal and solve the cases like losses of singing voice, missing props-resembled-ancient items and a vengeful girl, who wants revenge on Mane Seven and Dragon Strike Force for the death of her brother. However, someone was watching the event behind the shadows...