England in the 1920s.

Whilst K9 is off in the TARDIS leading the Black Guardian on a wild goose chase, the Doctor and Romana are enjoying a leisurely lifestyle as the Lord and Lady of a London townhouse. But trouble never stays away from them for long, and before they know it a chance discovery of alien technology leads them deep into the heart of the English countryside where a malign presence lurks.

As the Doctor dodges deadly butlers and ferocious gamekeepers, Romana is faced with a malevolent Aunt and an even deadlier peril - marriage.