At Little Strangehaven Primary, something horrible is happening. What are the strange SHIVERS that keep hitting the school and leaving Strangeness in their wake, such uncontrollable ballroom dancing and a chicken attack by the military? Agatha Topps, a spy detective, is keen to learn more. She is the only individual who doesn't immediately forget about the Strangeness after it has passed. At least until Lenny Tuchus, a new boy, shows in and starts to recall. They discover the Book of Chaos, an antiquated book that has been stashed away in the Room of Forbidden and Dangerous Books, thanks to their spy detection skills. Can Agatha and Lenny stop the SHIVERS before their village is swept into oblivion by fending off attacks from wicked underpants and Transylvanian gargoyles? Because books have power, especially this one.