There's a new craze sweeping across the country - the mysterious DJ Peterman and his "Purple" club.

Everyone wants to be a part of it - nobody wants to be left out.

But when a competition is launched to find the real DJ Peterman, Dinah and her friends become suspicious.

Could the DJ be their old enemy, the Demon Headmaster, in disguise?

A fast-moving story with a series of surprising twists.