It could be a thriller. Since it's based on a true story, there might be elements of real - life danger and suspense that would fit well in the thriller genre.
Another possibility is that it could be a mystery. Given that it's based on a true story, there could be an unsolved aspect to it that the 'watcher' is trying to figure out. Maybe it's about a detective or a citizen trying to solve a real - life mystery, and the process of watching and gathering clues is central to the story.
Well, it could be a thriller. If there's a watcher involved, there might be some sense of mystery and danger, which are typical elements of a thriller.
It could be a thriller. If there were some dangerous or mysterious events that happened in the ravine in real life, it would make for a great thriller plot.
It could be a thriller. If it's about a true - life crime or a dangerous situation, the elements of suspense and danger would fit well into the thriller genre.
It could be a drama. Since it's based on a true story about the afflicted, it's likely to involve a lot of emotional and complex human situations which are typical of the drama genre.
It could be a drama. Since it's based on a true story about a boy, it might deal with real - life emotions and situations that are often found in dramas, like family relationships or personal growth.
It might be a drama genre. Given that it's based on a true story, it could be about the emotional and interpersonal relationships of the twelve people. For example, if it's about twelve family members dealing with a family - related real - life issue, it would be a drama.
Maybe it's a documentary - style work. Since it's based on a true story, it might present facts about Nathan's life in a non - fictional way, similar to how documentaries are made. It could include interviews, real - life footage if available, and a narration of his story.
It could be a horror genre. Since it involves the concept of being 'possessed', which is often associated with scary and disturbing elements like the loss of control over one's self, and the presence of some unknown and potentially malevolent force. This is a common theme in horror works.
It could be a thriller. True stories often have elements of mystery and danger, and when a stranger is involved, it can add to the suspense. For example, if the stranger is linked to a crime or some sort of secret.
It could be a thriller if the 'swarm' represents something menacing like a swarm of locusts or a group of criminals.