Write an original short suspense scene for a small AI-film exercise.

Premise: Someone finds a reply beside a letter they have not sent.
Audience: General adult drama audience.
Constraints: One archive room at night, one offscreen adult character, a teal desk lamp with brass stem and coral switch, a blank envelope and an ivory reply card. No visible actor or hand is required. Keep the props in fixed positions. Do not add a chase, a second location or a new character.

Story turn: Begin with the unsent letter, reveal an impossible reply, then interrupt with one offscreen knock. End before explaining who is outside.

Return:
1. A one-sentence logline
2. A short screenplay draft with a scene heading, visible action, a character cue and no more than one spoken sentence
3. Three candidate shots, each with the new information it reveals, framing, sound and prop state
4. A list of unresolved production decisions

Use present-tense visible action. Separate spoken words from sound effects. Do not assign exact runtime from page length. Do not promise model consistency or invent a successful generated take. Mark the result as a draft for human revision. Use plain-text Fountain-style layout; keep any file export separate from the actual movie-generation workflow.