The basic story is of Carl Denham (Robert Armstrong), who makes those cute little animal pictures that are going out of style. If he wants to stay in business he must add a female interest and some excitement. Circumstances forcing him to leave port quickly, he meets a girl Ann Darrow (Fay Wray), that is down on her luck and convinces her that he will make her a star (on the up and up).
Things get complicated as you know it is bad luck to bring a woman onboard a freighter. And Ann really stirs them up including the first mate, Jack Driscoll (Bruce Cabot). On top of this she has a large date awaiting her at Skull Island.
I will not tell the rest of the story just incase you are one of the few that has missed the movie. But as you have guessed it includes a big ape named KONG. Not that cheesy thing that is always tussling around in Japanese movies, but a much more convincing Kong that can show great emotion.
You are about to watch the eight wonder of the world.