A revolutionary new textile formula gets stolen and the developer's daughter asks Simon for help.
The hunt for the fifth segment of the Key to Time lands the Doctor and Romana in trouble on the third moon of Delta Magna.
Oscar Newley has perfected a new fuel injection system for his racing car and approaches Simon for financial backing.
Agents in Steed's department are being fooled into giving away secrets, by men posing as Army officers at a fake Government training establishment. And their next victim is... Tara King.
Emma is behind the wheel for a deadly car race.
