'The sea turtles are disappearing from their habitat on the Queensland coast. It's up to the five friends to solve the mystery of where the turtles could have gone. Perhaps someone or something has snatched them away. Thanks to their rainbow necklace, the girls are taken back in time and given some important information by a famous Australian explorer. Can the girls save the day? With some clever advertising and a beach rescue only time will tell.' (Publication summary)