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.

  1. A crime occurs.
  2. By design or accident, the crime is completely misinterpreted.
  3. The solver(s) proceeds forward in good faith, as if it were one of the other types of simple mysteries or whatever.
  4. Discrepancies build up.
  5. The crime is revealed to be not what it was supposed to be.
  6. 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.