In 'Batman Last Knight on Earth Graphic Novel', the world has been destroyed. Batman finds himself in a situation where he has to piece together what happened. He meets old friends and foes in different forms. The story is filled with mystery as he tries to figure out how to reverse the apocalypse or at least find a way to make the world a better place again. There are also some really cool action scenes where he shows his skills even in this dire situation.
The plot involves Batman navigating a desolate Earth. There are new and strange villains and situations. He has to use his wits and combat skills more than ever. For example, he might encounter mutated creatures or groups with their own agendas in this new world order. And throughout the story, we see his determination to protect what's left of humanity.