Private detective Nigel Strangeways receives a call for help from Wonderland, a new holiday camp that has recently opened only to be plagued by a series of cruel practical jokes conducted by someone calling themselves 'The Mad Hatter'. The camp's owners are convinced a rival firm, desperate to put them out of business, is behind the events. Or could it be a disgruntled employee, or even one of the four hundred guests currently staying at the camp? As the pranks become increasingly dangerous and tensions rise, Nigel must do all he can to uncover the Mad Hatter's true identity - before it's too late.