"All You Zombies" by Robert A. Heinlein

I read this short story after watching the movie "Predestination" which followed the story quite carefully, down to the dialog. The movie did add elements, such as the Fizzle killer. Ray tells me the movie, like the book, is a mental puzzle. The protagonist is mother, father and daughter due to having 2 sex organs and access to time travel. I found the story, like the movie, to be interesting but coldly unsatisfying.