Here's why this is considered the climax:
* Resolution of the central conflict: The entire story revolves around the mystery of May's disappearance and the search for her. The discovery of her body finally resolves this central conflict, though it does so tragically.
* Emotional peak: The discovery of May's body is a devastating and emotionally charged moment. It triggers a wave of grief, guilt, and confusion for Ellie and the other characters.
* Turning point: The discovery of May's body changes the course of the story significantly. The focus shifts from the search to dealing with the aftermath and the emotional toll of May's death.
While there are other moments of tension and suspense in the book, this is arguably the most impactful and dramatic event, and it sets the stage for the resolution of the story.