Horror is the most malleable film genre because the enjoyability of a horror film doesn’t rest solely on its quality; schlock and gore can be regarded highly if a certain tone and pitch is satisfying. For something like Undertone, the pleasure gleaned isn’t from the writing or plot, but from how you are immersed and manipulated into fear through visuals and sound design. It has a vibe like The Blair Witch Project, where you feel isolated and as if you can’t see beyond the main character’s vantage point as the audience. Nina Kira (Evy), while not transcendent, did admirable work to keep this train on schedule.