The document types and their distinct voices
Found footage prose horror draws its richness from the variety of document types it can incorporate: journals, letters, text messages, emails, transcripts, forum posts, news articles, social media archives, video descriptions, audio transcriptions, medical or police records, and many others. Each has a specific voice, a specific set of conventions, and a specific set of limitations that should be respected for the illusion to hold. Writing multiple document types convincingly requires understanding not just the surface features of each (how a text message looks versus how a formal letter looks) but the deeper conventions that govern each (what topics a text message would and would not address, how a journal differs from a diary, how a police interview transcript is structured). The document variety creates tonal rhythm: the horror that accumulates differently in each medium.
The horror of incomplete information
Found footage horror's defining feature is that the documents are always incomplete: something is missing, whether through damage, deletion, interruption, or the simple fact that the recorder did not record the worst moment. This incompleteness is the genre's central source of horror, because what the reader imagines happening in the gap is always more frightening than what could be put on the page. Writing incompleteness that works requires designing each gap with care: the break in the record should come at the precise moment that maximizes the reader's horror at what is implied, the surrounding material should give the reader enough to work with that the inference is both possible and terrible, and the missing content should remain genuinely uncertain rather than easily inferrable.
Retroactive dread and the planted detail
Found footage prose horror's most sophisticated technique is the detail in early documents that becomes sinister only in retrospect: the reader who knows how the story ends reads the beginning differently. Planting these details requires writing early sections with full awareness of what they will mean later: the seemingly innocuous description that is actually the first evidence of the threat, the character behavior that is explained by the character as stress or illness but that the ending reveals as the beginning of something worse, the setting detail that the reader initially accepts as local color but later recognizes as significant. The best planted details are ones that cannot be seen as anything other than innocent on first reading, which requires the author to inhabit the perspective of someone who does not yet know what is coming.
The editor as narrator
The compiler or editor who frames the found documents is a narrative voice that found footage prose handles with varying degrees of explicitness. The most interesting editors are those whose own perspective and psychology are visible in the selection, arrangement, and annotation of the documents: the editor who has reasons for including certain materials and excluding others, who makes annotations that reveal their own knowledge or ignorance, whose framing statements change in tone as the horror of the material becomes clear. The editor can also be a red herring, a reliable interpreter, an unreliable narrator in their own right, or a figure whose fate the reader eventually understands. The editor who is themselves a character, not just a function, adds an entire additional layer of narrative to the found footage structure.
Medium as message
The specific medium of each found document carries meaning beyond its content: a text message sent at 3 AM carries different weight than the same words sent at noon; a journal entry that becomes increasingly illegible carries different weight than one that remains neat; a recording that captures background sound the recorder did not notice carries different weight than a clean recording. Writing medium as message requires thinking about what each medium reveals beyond its explicit content: the state of the person producing it (handwriting that deteriorates, sentence structures that become fragmented, increasing repetition), the context in which it was produced (background sounds, timestamps, the other messages in a thread), and what it was not designed to record but recorded anyway.
The ending that the documents cannot contain
Found footage horror typically ends at the point where the documentation stops, which means the ending is often implied rather than shown: the final document is the last record before something happened that prevented further recording. Writing this kind of ending requires designing the final documents so that the reader knows something terrible happened without being told what it was, or has enough information to understand what happened without the story saying it explicitly. The ending that the documents cannot contain is not a failure of resolution but a specific form of resolution: the horror is confirmed by the silence rather than described in it. The final absence of further documents is itself the ending.