Ellie and the Secret Potion by Gillian Shields - USED

Coral Kingdom is protected by six powerful crystals which fade each year and have to be replaced. Queen Neptuna sends six young mermaids on a mission to fetch the new crystals. Can they battle the wicked-natured Mantora, help the sea life and make it back in time?
The mermaid friends make a dreadful discover and it's up to Ellie to find a very special ingredient to add to her potion to help her mermaid friends, as well as saving a group of sea gulls from a sticky end.

ISBN: 9780747587668