Casey loves to make the merfriends of Crystal Cove laugh – especially if it means using a little bit of magic! But when Casey ignores the dangers of using magic and a mer-pet gets stolen, Casey and their best friend Riley must go on a rescue mission to the eerie Kelp Forest – and into the territory ...

Casey loves to make the merfriends of Crystal Cove laugh – especially if it means using a little bit of magic! But when Casey ignores the dangers of using magic and a mer-pet gets stolen, Casey and their best friend Riley must go on a rescue mission to the eerie Kelp Forest – and into the territory of sea witches.