During a rampaging storm, a shaken young woman arrives at a stranger's door in an RV park seeking shelter. They both question motives and desires as things escalate to a deadly, bizarre showdown.
This movie contains 15 potentially triggering events.
The character is a serial killer, but it's not implied that they have any specific diagnosis. There are some audio and visual hallucinations, but those may be chalked up to sleep deprivation and drug use earlier in the movie.
slow flashes though, with the lights/electricity giving out, mostly to illuminate the scene in flashes, and some small amounts of lightning limited by the window frames. Near the end there is some very very flashy red and blue police lights which fill up the whole screen. It lasts for perhaps under a minute. A short pause of a minute or two and then the slow blue and red lights happen again. Not flashing, just changing colour every second or so. You have a couple of minutes and then there are bursts of very flashy lights with the police lights again. It does stop after a few moments.