Eleventh broadcast episode of The Prisoner, where Number Six foils ... ahh, that would be telling!

Reference

It's Your Funeral - Wikipedia, the free encyclopedia
""It's Your Funeral" is the eleventh episode of the television series The Prisoner. In this episode, a young successor to Number 2 plots to assassinate the retiring Number 2 and ensure his own success. ..."

Memorable Scenes

Number 6 and watchmaker's daughter try to dissuade her father
The Watchmaker (addressing daughter): You refuse to understand. What I'm doing is for a principle. We are in this prison for life, all of us, but I have met no one here who has committed a crime. I protest in a manner they cannot ignore.
Number 6: Some other way, then—not by an act of murder.