Peter 'Mad Max' Maxwell, the 'dinosaur' Head of Sixth Form at Leighford High, doesn't know how to use a computer. However, it becomes vital that he learns when some of his female pupils begin receiving threatening messages, with the anonymous sender claiming to know intimate details about the girls' personal lives. Then Max starts to receive messages too...and two of the girls go missing. When a body is found, it seems that the prank has taken a sinister turn. His wife is pressuring him to retire, but the chance of Mad Max reaching retirement looks increasingly unlikely.