'The more the Doctor dreams,' the Quack said, 'The more real I become. He has not yet dreamed me fully, but he will.'

When the TARDIS lands in the idyllic gardens of a Victorian country house, Ace knows something terrible is bound to happen. The Doctor disagrees. Sometimes things really are as perfect as they seem.

Then they discover a young girl whose body has been possessed by a beautiful but lethal insect. And they meet the people of the House: innocents who have never known age, pain, or death - until now.

Now their rural paradise is turning into a world of nightmare. A world in which the familiar is being twisted into something evil and strange. A world ruled by the Quack, whose patent medicines are deadly poisons and whose aim is the total destruction of the Doctor.