When mysterious omens begin appearing throughout Equestria, Princess Celestia charges Twilight Sparkle and her friends with investigating the strange occurrences. What the six ponies will discover goes far beyond anything they had ever imagined. In a world where myth and legend are commonplace, the ponies will have to question everything they once thought was "only a story" and delve deep into the realms of Equestria's own mythology if they are to uncover the truth behind the strange omens and unlock the secret of Applelantis.