I think unheard has a great plot and a lot going for it. It had all the right elements and could have been so much better, but it ends up being a tedious and slow thriller. It also suffers from an identity crisis and doesn't know if it wants to be a serial killer movie, supernatural or a family drama.
The film is about a young woman staying alone at her family's cabin while she participates in an experimental procedure to try and regain her hearing she lost at 8 years old. The procedure is successful and she starts hearing things beyond the grave.
The acting of the main character is too subtle and relaxed. She makes some stupid decisions by the end. Acting against normal flight or fight insights. By the second half all the characters acting and dialogue became really strange and out of character.
There are aspects of this film that are creepy, but because of the slow pace and confusing narrative, it doesn't work. The film is over two hours long and doesn't establish much in that slightly above-average runtime.
Overall, I give this movie 5 stars. There was a lot this movie had going for it and had some original ideas I liked.
Warning, the last several minutes of the film are jarring, the visuals and noise become extremely erratic (hence the warning at the beginning for those prone to seizures).