Cleo has a cousin that lives in America. They haven't seen each other in soooooo long. Since they were very little and Percy's mum married that horrid man Gabe. Finally, they are reunited when Aunt Sally decides it will be good to see Cleo and Kim along with their father. Percy has only 2 mortal cousins, one of which he has never met but is the younger sister of his other, Cleo. He cannot remember a lot about her, only that she lives in Australia by the coast and her dad is his mom's brother. When Sally decides Percy, Paul, their few-months-old baby and herself should go visit her brother, will both Cleo and Percy keep their secrets?