Pearl by Lisa Pinkham
Addy’s twelfth birthday changes everything.
When she receives a mysterious collection of dolls and a magic opal necklace, she soon finds herself on the beach with a mermaid, talking to underwater fairies, and swimming with mind-reading dolphins.
But danger lurks in the deep. When her opal necklace is stolen, and her new best friend,Pearl, is nowhere in sight, Addy has to fight for her life.
Suddenly alone, with no magic and no way home, she comes face-to-face with the thief. She’ll have to find the magic within herself, and trust it to be enough to make things right.