Azure Harmony loves to sing. But she sings in a way no other pony does. Her sister is the only pony who has heard and loved to hear her sing. And, Harmony's singing skills could be the only key to her sister's rescue.
Moonstone Ruby really loves her alicorn school. But when she find out about a lost explorer and a dangerous pony on a forsaken island, her natural curiosity fires up...and when she goes to the island she finds herself fighting for her life.