Jennifer Hale's life changed forever once she literally uncovered (in a crate at the museum she worked out) the ingenious steam and watchwork contrivance known as Mr. Hero. She, herself, remains as full of life and humor as ever, and perhaps at first welcomed the exciting and weird adventures that came along with Mr. Hero, but now things are getting serious, and a lot darker and more dangerous. Jennifer and Mr. Hero, alongside Adam Cain, battle monsters, travel to a jungle world and meet a female version of Mr. Hero named Prima, who knows much about Mr. Hero's mysterious past. But ultimately all roads lead back to the nightmarish world of Kalighoul, the planet ruled by insane, power-mad Teknophage. It is there that all is revealed about Mr. Hero's past, including the secret of his two heads!