Join Murph Cooper and the Super Zeroes as they team up with wonderful school librarian and secret superhero Mrs Fletcher (whose special power is that her head can turn into a foghorn) to foil a dastardly, 1000-decibel plot. When Mrs Fletcher's friend Margaret disappears from her duties as town librarian, it's clear that there's something strange afoot. A librarian never deserts their post! Plus the library has suddenly started hosting a whole host of ludicrously loud events. Cow choirs, pneumatic drill masterclasses, stamping competitions - could a dastardly criminal be using the library to cover up a crime of epic proportions?