It’s from God emperor of dune, i think it’s the fourth book in the series by publication, but not chronologically.
I guess this might be a spoiler if they eventually make it a movie, but basically, the son of Paul merges himself with a sand worm and becomes effectively immortal. It’s both interesting and bizarre.
There’s a lot more to it than that but i don’t want to ruin the story for anyone
Not going to lie to you, this is exactly what i did :)