After the apparent suicide of her sister, Julia attempts to investigate what she considers to be suspicious circumstances- her sister was blind and Julia is in the process of losing her sight as well. As she attempts to unravel the mystery around her, she comes closer and closer to complete blindness.
This movie provides examples of:
- Alone with the Psycho: Very subtly but it grows more and more as the film goes on with Julia dealing with Ángel.
- Bittersweet Ending: Julia is blind at the end of the film but has embraced her condition.
- By the Eyes of the Blind: Ángel feels invisible to those around him and is only noticed by those who are blind. Thus, his obsession with Julia and her sister.
- Colour Coded Eyes: Julia's green eyes are mentioned by a man in a restaurant. Her eyes are obviously an important plot point.
- Don't Look at Me!: At the climax,Ángel says this to the arriving police after spending much of the film bemoaning that no one notices him.
- Driven to Suicide: The apparent fate of Julia's sister and, later, husband, with the latter being that he was cheating on Julia with her sister..
- Eye Scream:
- Ángel holds a knife dangerously close to Julia's eyes to see if she is really blind.
- When it's revealed that Ángel's "blind" mother can really see, he injects a needle into her eye with a fluid to blind her again... in excruciating close-up.
- The Faceless: During the middle of the film, when Julia has her eyes bandaged, everyone she interacts with has their face obscured to the viewer; either we see them from behind or their head is cut off by the camera.
- Fright Beside Them Julia stands with her husband at her sister's funeral. While kneeling down before the casket to pay her last respects, she feels a comforting hand on her shoulder. She smiles, and lays her own hand on top. A moment later, the other hand is withdrawn, and she looks up to see her husband talking to two men off in the distance. She whirls around to see whose hand was on her shoulder, but no one is there.
- Hair of Gold, Heart of Gold: Julia is a blonde and she is naïve, innocent, and good at heart (as well as generally helpless).
- Invisibility: Ángel is not literally invisible, but he's referred to as such in that he's hard to notice or remember.
- Nothing Is Scarier: Many shots of the film are obscured and hidden away, making the film incredibly unsettling and omnious.
- Stalker Shrine: Julia finally removes her bandages in Ángel's apartment and discovers a photo collage on his wall. Included are various nude women, Julia's sister Sara (some pictures taken during her death by asphyxiation), and Julia herself (all the photos of Julia and some of the other women have their eyes blacked out).
- Sibling Triangle: Julia, Sara and Isaac, as revealed after his suicide. Julie doesn't take it well.
- Spiritual Successor: To The Orphanage, also starring Belen Rueda and produced by Guillermo del Toro.