"The world is and has always been a dangerous place. Now it's up to you, Martin Healthway, to stop that danger." Ever since Martin has discovered the lost city of Antica, his life has changed, but when he meets a girl, Ariel about his age, life doesn't seem so bad. But he soon discovers that he has no escape from this forbidden city, that Ariel is actually a mermaid, that this city was once guarded by Winged Soldiers and the truth about his past...