Well, it might involve a character's big decision, a surprise reveal, or a setup for the next chapter. But the possibilities are endless until you actually read it.
In chapter 40 of 'Beginning After the End', it could be that the story begins to explore deeper themes. There might be more in - depth exploration of magic systems if there are any in the novel. The political situation in the fictional world might become more convoluted, leading to more intrigue and drama. Characters could start to question their beliefs and values more deeply as they are faced with new situations. It's also possible that we see the start of a new arc that ties in with the overall plot, such as a search for a lost artifact or the discovery of a hidden power.
It's a matter of personal preference. Some people might like it for its unique plot and characters. The story often has elements that can be engaging, like interesting power systems and character development.