Problem
From "Let 'Em Play God" by Alfred Hitchcock
1. The audience knows everything from the start, the players know nothing. There is not a single detail to puzzle the audience. It is certainly not a whodunit for the simple reason that everyone out front knows who did it. No one on the screen knows except the two murderers. The fact that the audience watches actors go blithely through an atmosphere that is loaded with evil makes for real suspense.
2. These are the questions, now, that constantly pop up. Will the murderers break and give themselves away? When the victim does not show up for the party will his father suspect? Will Jimmy get killed before he discovers the actual crime? How long will that body lie in its wooden grave at a champagne party without being discovered? If we are successful we'll have the audience at such a pitch that they want to shout every time one of the players goes near that chest.