A vertex is the highest or lowest point in a parabola.
Treetop, the highest point on any tree.
The apex or summit is the highest place.
I would consider the roofline the highest point, or the "ridge".
The highest point is sometimes called the zenith, peak, apogee, maximum or a number of other synonyms.
The point (or points) where the plot is at its highest.
The highest stage in a plot is the climax.
That is typically referred to as the climax of the story, where all the separate plot-lines come together and reach their highest point of tension or conflict.
The plot element where the tension of the story reaches its highest point is known as the climax. It is the moment of greatest intensity or conflict in the narrative, where the protagonist faces their biggest obstacle or makes a crucial decision that determines the outcome of the story.
The climax is the point of highest interest where the problem begins to be resolved.
The stage of a plot that includes the key turning point of the story is called the climax. It is the moment of highest tension and drama, where the conflict reaches its peak and the outcome of the story is determined.
The turning point in a plot is the climax.
The climax is the point of highest tension or conflict in a story, where the outcome becomes clear and leads to the resolution. It is the turning point that determines the direction of the plot and typically occurs towards the end of the story.
The climax of the plot is typically considered to be the most exciting element. It is the point of highest tension, where the conflict reaches its peak and the outcome becomes clear.
falling action
The climax of a story is sometimes not always the middle of the story but Climax means the highest point so when the problem comes up in a story, the plot, it would be in the climax.
A plot diagram typically includes exposition, rising action, climax, falling action, and resolution. To determine where a specific sentence belongs, consider the sentence's content and how it relates to the overall storyline. If the sentence describes a major turning point or the highest point of tension in the story, it would likely be placed at the climax of the plot diagram.