A mystery feature film typically runs 100-115 pages and is defined by puzzle-driven narratives where the audience pieces together clues alongside the protagonist. mystery features are built on questions, misdirection, and revelation.
Fair play is essential — every clue the detective uses to solve the case must be available to the audience, even if disguised. Red herrings should be plausible enough to sustain suspicion. The detective (or protagonist) needs a unique methodology or perspective that makes their investigation distinctive. Interview and interrogation scenes are genre staples — each one should reveal character as well as information. The solution must be surprising but inevitable in retrospect. Avoid the coincidence solve.
Act one presents the mystery and establishes the investigator and suspects (25 pages). Act two follows the investigation through a series of interviews, discoveries, and dead ends, with a midpoint false solve that reframes the case (55 pages). Act three narrows to the true solution through a final confrontation or revelation (25 pages). The reveal scene must be both intellectually satisfying and emotionally resonant.
Plot backward from the solution. Know who did it and why before you write page one.
Plant every clue the audience needs to solve the mystery — hide them in plain sight among red herrings.
Give your investigator a unique perspective or method that makes their approach to the case distinctive.
Write the reveal scene first, then go back and seed the clues that make it satisfying.
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