The most exciting and tense part of a story is the

The most exciting and tense part of a story is the climax. The climax is the point of maximum tension or conflict in a story, where the main character(s) face their greatest challenge or conflict, and the outcome is uncertain. It is usually the turning point in the story, and the moment of highest emotion or excitement for the reader. After the climax, the story begins to wind down towards its resolution, or denouement.