In the aftermath of the Second World War, Brigadier Lethbridge-Stewart - then a young subaltan - was involved in intelligence operations in the Greek islands. But now his problems are rather closer to home.
The Doctor and Jo are caught up in mysterious events in a small English village. Sergeant Benton and Captain Yates are ready to rush to the rescue. A sinister cult holds unholy ceremonies and prepares for a day of reckoning. And the Doctor has a shrewd idea who might be behind it all.
This might seem like business as usual, but things are not always as they seem. The Brigadier finds himself trying to separate the truth from the lies, and the past from the present. Can he once again help prevent the end of the world? His friends and colleagues are not so sure - because this time, the Brigadier has fallen in love...