Knights from a parallel universe arrive on Earth to find the legendary sword Excalibur. Only the Doctor and Ace, with the assistance of Brigadier Lethbridge-Stewart, can save the Earth from total catastrophe.

'My word is my bond. And I thought only schmucks do business like that.' Gino, a Russian gangster, is playing for higher stakes than most when he invests in the British stock exchange. Any drop in share prices could put his life in immediate danger.

Miles Henderson has a few problems. His job, his marriage and his car are all falling apart at the same time. The last thing he needs is to be followed by a beautiful woman and a pair of private detectives - in that order.