An unnamed time traveler sees the future of man (802,701 A.D.) and then the inevitable future of the world. He tells his tale in detail.
I grew up on the Rod Taylor /George Pal movie. When I started the book I expected it to be slightly different with a tad more complexity as with most book/movie relationships. I was surprised to find the reason for the breakup of species (Morlock and Eloi) was class Vs atomic (in later movie versions it was political). I could live with that but to find that some little pink thing replaced Yvette Mimieux was too munch.
After al the surprises we can look at the story as unique in its time, first published in 1895, yet the message is timeless. The writing and timing could not have been better. And the ending was certainly appropriate for the world that he describes. Possibly if the story were written today the species division would be based on eugenics.