What is the climax of "The Possibility of Evil" and why?

In literature, a climax is a moment in which the tension in a story reaches its peak. It is also helpful to think of the climax as a turning point in a story, a moment which leads directly to the resolution.

In "The Possibility of Evil," the climax occurs when Miss Strangeworth goes to the mail slot at the post office and accidentally drops one of her poison pen letters. Instead of posting this letter,...

In literature, a climax is a moment in which the tension in a story reaches its peak. It is also helpful to think of the climax as a turning point in a story, a moment which leads directly to the resolution.

In "The Possibility of Evil," the climax occurs when Miss Strangeworth goes to the mail slot at the post office and accidentally drops one of her poison pen letters. Instead of posting this letter, it is picked up by the Harris boy who sees that it is addressed to Don Crane. Thinking it might be important, the Harris boy decides to deliver it to Don Crane himself.

This moment is climactic because the audience realizes that once Don Crane receives the letter, Miss Strangeworth's secret will become public knowledge. Everybody will know (and have undeniable proof) that she is the author of the poison pen letters. What really adds to the tension in this scene is that Miss Strangeworth has no idea that her letter has been intercepted by the Harris boy. As a result, she is powerless to stop this chain of events.