Two sets of rules/unities for potential film and video structures: Van Dine and Aristotle!
Van Dine’s Rules
1) viewer must have equal opportunity with the detective for solving the mystery.
2) no willful tricks will be played on the viewer, unless a trick played by the culprit on the detective.
3) there must be no love interest.
4) the detective must not be the culprit.
5) the culprit’s identity must not be established by accident or coincidence.
6) an active detective must be present.
7) there must be a corpse.
8) no supernatural elements are allowed (no seances).
9) there must not be more than one detective.
10) the culprit must figure prominently in the story.
11) the culprit must not be a servant.
12) there must not be more than one culprit.
13) no secret societies/mafia.
14) a repeat of 8.
15) truth of problem must be apparent to the reader.
16) no long passages of descriptive or atmospheric effect.
17) culprit must not be a professional criminal.
18) no accidents or suicides.
19) culprit’s motives must be personal.
20) no obvious devices: coded letters, mistaken identity, etc.
And…
The Three Classical Unities:
- The unity of action: a play should have one main action that it follows, with no or few subplots.
- The unity of place: a play should cover a single physical space and should not attempt to compress geography, nor should the stage represent more than one place.
- The unity of time: the action in a play should take place over no more than 24 hours.