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 . . . ?