The leaking of secrets at Carmadoc Research Establishment throws suspicion on to Steed, who must suffer the torment of house arrest while Tara goes in with a new partner.

Steed and Cathy eat at a Chinese restaurant, but, as ever, it’s not just for fun: Steed suspects the owner, Mr Lo, of gold smuggling. He also seems to be…

Plato, the most advanced computer in the world, which could be used to target intercepting missiles, keeps breaking down. The body of a professor on the team is found within.

Simon investigates an assignation attempt against the prime minister of a British colony.