Catt's big brother takes care of her, but when it seems like trouble is brewing in the port city where they live, he puts her in a temple school and runs away to sea. Catt runs away from the creepy school and tries to follow her brother, but she accidentally stows away on the wrong ship! Adventure awaits Catt, along with piracy, shipwreck, magic scrolls, thievery, a mermaid who wants a bargain, a man who stole her brother's name, and a murderous sea-captain who is most certainly not her mother. Will the courage and experience that Catt finds along the way be enough for her to save her brother from the cryptic trap he has fallen into?