Where is the climax, turning point and rising action. (either of the three would do)
These are terms used in drama to discuss the stucture of the development of dramatic energy and tension; they are each slightly different, but all speak to moments that increase the "stakes" for the audience. They actually occur in reverse order: rising action signifies the occasion that complicates and moves the plot developments (and characters) forward. The turning point is the place in the plot where the dynamics cannot be reversed; the climax is the height of dramatic tension.