What's wrong with all the telephones? Why is there no news on the television? And why aren't people allowed to ask questions? Dinah and her friends know that something terrible is happening.

But when they start to investigate, they realize Dinah is being tracked down.

It looks as though the Demon Headmaster is behind it all, but the Headmaster has vanished for ever...hasn't he?

This is the fifth title in the best-selling series which inspired the top-rating TV series.