Firstly for a subplot of a story made into a film makes it very interesting. Kudos to the director as the title is the exact one liner for the story. The movie has the ability to capture the attention and instill a sense of awareness in the viewer’s mind. The abrupt end, will make many people a bit taken aback, rightly fitting the entire plot of making it an erie thriller. The concept of the movie is fascinating as the creatures that hunt by hearing sounds are killed by high frequency.