I’m not sure I’m going to do this one justice, so I saved it for last (so far). I’m calling it The Big Twist.
- A crime occurs.
 - By design or accident, the crime is completely misinterpreted.
 - The solver(s) proceeds forward in good faith, as if it were one of the other types of simple mysteries or whatever.
 - Discrepancies build up.
 - The crime is revealed to be not what it was supposed to be.
 - Wrap-up, the end.
 
A note, the solvers are often in some kind of danger. This is stuff like Shutter Island, Gone Girl, and And Then There Were None.

