What is the plot summary of the story before you die?

"Before You Die" is a gripping tale about a man named John who receives a mysterious letter cryptically instructing him to ensure a stranger's wish is fulfilled before he dies. John embarks on a journey to uncover the stranger's identity and the nature of the wish, leading to unexpected twists and revelations that challenge his beliefs about life and death. As John delves deeper into the mysterious request, he grApples with his own mortality and the true meaning of fulfillment.