No-one the Croc King curses ever escapes Avenger. Avenger never gives up. It always tracks you down. Frankie Sparks and her brother Jin are going about their lives as normal, when Mizz Z, the formidable secret agent, arrives in town on a mission. She's on the hunt for some ancient relics, relics that everybody thinks have lost their powers completely. Everybody is wrong. The spirit of the tyrant Crocodile King has been lurking for years, waiting for his chance to return and release Avenger, his killing-machine tracker, once more. Frankie and Jin find themselves caught up in a centuries-old curse. Can they help Mizz Z to break it, or will the evil Avenger claim another victim?