The phrase "final chapter" refers to the end or conclusion of a story or a situation. It suggests that everything comes to an end and there won't be any more after that point. Full definition
The appearance of the character's mother is also a nice touch that sets up the fitting final chapter of the story. (johnhanlonreviews.com)
There's no sense in which this is a standalone work, but the same can be said for many final chapters in literature. (screenanarchy.com)
In an unusual chapter - based structure, you jump around from character to character, learning all about them before bringing the whole band together for an epic final chapter. (toucharcade.com)