For me, the structure depends on what the story is and what are the goals of the story. I'll structure a one-off or short series differently than a continuing story, but they do have some pieces in common.
First, who are the characters and whose story is it? I read your story last night, and it looks like it's centered on the point of view of the man. If he's the protagonist, what's his story?
Second, after I figure out whose story it is comes the how to tell it. Are we in their head hearing their thoughts, are we bouncing around, are we a fly on the wall, is this happening now, yesterday, or tomorrow? Once I answer those questions, I like to set up the character if they're not known yet. This gives me a baseline of what's going to happen.
Next, what is the crazy stuff that happens to make it an interesting story to tell? In chapter 4 the wife is being convicted of murder and being sold into slavery? Does the man try to intervene or let it happen? Will he try to give her a soft landing or dump her like yesterday's trash? What happens when he finds out that one of his rivals is trying to buy her?
What happens after? Does the story have a conclusion or is it open ended? If you have a conclusion, does this proceed directly toward it or meander around? Does the wife get tortured into spilling all of her secrets about her now ex-husband? Does the husband decide to try to buy the wife back? Does he screw the secretary instead? And is there another story to tell after the conclusion.
One thing that helps me when structuring a story is I like to talk to the characters before I write anything. They've lived an entire lifetime in their universe before fingers touch the keyboard. Yes, I know, they only exist in your head at this point, but I'll try to talk to them, or at least understand where they're coming from. I don't need to know what their favorite meals are right off the bat, but I want to know why are they here? Imagine you're meeting them for the first time for a lunch interview. Where do you go? What do you do? Understanding where they come from will explain how they'll react when crazy shit happens. If the husband just saw evidence that his wife murdered the wife of one of his employees, how he will react will depend on how he got here. Was he sick of her shit? Did he want to leave her before? Is he crushed that his wife is going away, or is he glad that he's rid of her? Talking to him will expose how he would react? What happens if the victim's husband buys the wife?
Once I know the characters, I can throw the crazy shit at them, but they might still behave a little unpredictably. The husband may be sick of his wife's shit, but does he try to save her for their kids, or does he set up a shell company to buy her to have her beaten and raped? Can he live with his decision either way?
Ultimately, know your characters and sketch out some ideas and see what works. My favorite way of getting to know my characters is talking with them/to myself while driving.
Hope this helps. You've got a good start, just figure out where you want to take it, and don't be afraid to change directions if it doesn't work. In one story I'm working on, one of the accomplices will get torn up about his role in events he participated in, and he'll have a bit of a freak-out over it. It wasn't going to happen originally, but events are twisting as I write them, and it feels like a better path going forward.