Making peace with the past & friends for a lifetime. Elly is sent by her father to stay with her Aunt Dina on Sunday Island for the whole summer. With no friends Elly is bored. So when she receives a mysterious invitation for a midnight meeting she sneaks out of the house only to stumble into a bemused girl called Sierra who is just as lost as Elly. A helpful little dog leads them into an overgrown maze.. .where a grinning girl called Tash meets them. 'I thought a midnight feast would be a great start to our summer on Mystery Island!' The three girls have a lot of fun together swimming eating ice creams & exploring the isl&. By chance the girls discover that their pasts are linked. But an old mystery involving buried treasure threatens their friendship. Will the girls be able to solve the mystery & remain friends?