The sense of an ending what is the climax?

In "The Sense of an Ending" by Julian Barnes, the climax occurs when Tony Webster receives a mysterious legacy from the deceased ex-partner of his first girlfriend, Veronica. This revelation forces Tony to confront his past, particularly his memories of Veronica and his former friend, Adrian. As he uncovers the truth about the events that transpired decades earlier, Tony grApples with the reliability of his own recollections and the implications of his past actions, leading to a profound personal reckoning. This pivotal moment highlights themes of memory, regret, and the complexities of human relationships.