What connects a posh wine merchant's with a secret research establishment? And how much is a case of 1956 Chateau Lafitte anyway?
An episode set largely in a Cornwall cemetery, where people keep winding up buried even though they have no connection with the area. What's going on?
The influence of John le Carré's The Spy Who Came In from the Cold is obvious in this excellent episode, about Steed being interrogated for being a double agent