See you on a starry night

Eleven-year-old Juliet, her newly separated mother, and her older sister have moved to a Mission Beach, where she forms an instant bond with a girl her own age, Emma, even throwing bottles with secret messages into the sea; and then an email arrives, inviting Juliet to join the Starry Night Society, and all she has to do is make someone else's wish come true--but what about her own family, whom she seems to be growing apart from?.