All irregularities will be handled by the forces controlling each dimension. Transuranic, heavy elements may not be used where there is life. Medium atomic weights are available: Gold, Lead, Copper, Jet, Diamond, Radium, Sapphire, Silver and Steel. Sapphire and Steel have been assigned.

The school has stood for 100 years, and is rightly proud of its pupils' achievements. But not everyone wants to join in with the fun.

What are the teachers so scared of? Why have the school's ghosts chosen now to enact their revenge? And what terrible truth is the headmaster hiding?

Sapphire and Steel could spoil the party for everyone by asking such awkward questions. Perhaps they need teaching a lesson...