When a late member of this parish leaves Father Stanley Unwin a strange briefcase, it unexpectedly changes Unwin's life.
Inside the briefcase is a miniaturisation device, and the parishioner's request is the Father Unwin uses it as he sees fit for the good of mankind.
Father Unwin decides to use this "Minimizer" - which can shrink objects or people to one-third of their normal size - to aid British Intelligence.
Father Unwin's contact there is The Bishop (British Intelligence Service Headquarters Operation Priest).
- Father Stanley Unwin was played by real life actor Stanley Unwin.