Note: the film adapts a documented Brazilian criminal case — the 2012 murder of Marcos Kitano Matsunaga — so its outcome is a matter of public record rather than an invented twist. What follows discusses that outcome and the film's handling of it.
Structure as spoiler management. Vellas and screenwriters Raphael Montes and Mariana Torres deliberately decline to build an investigative thriller. Because the audience already knows the ending, suspense is relocated from what happened to how a person arrives there. The film is therefore constructed as a descent: a sequence of compressions and inventions — childhood material, private marital scenes with no documentary counterpart — arranged so that the killing reads as the terminal point of a process rather than as a rupture.
The withheld motive. The film's most significant choice is that it never supplies one. Multiple critics noted that the true reason for the murder remains speculative and that the film ends leaving more questions than answers, inviting each viewer to reach their own conclusions about the protagonist's actions. Nothing in the final act functions as a key that retroactively explains everything; the accumulated humiliations, the inequality of the marriage, the emotional abuse and the isolation are offered as conditions, not causes.
What becomes clear only afterwards. On reflection, the visual grammar has been arguing the film's thesis from the first scene: the cold palette, the narrow corridors and the framing of Elize at the edge of light establish confinement long before the plot justifies it. The luxury the marriage delivers is photographed as coldness throughout, so the apartment reads in retrospect less as a setting than as the mechanism. And the title resolves into its own reading of the ending — shadows of a woman is what the film says the audience is left with, and all the audience was ever going to get: an outline where a motive was expected.
The perspective trap. Because the narration is Elize's, everything shown is potentially the account she requires. The film never signals which of its invented scenes are memory and which are construction, so the ending can be experienced either as the culmination of documented suffering or as the closing argument of an unreliable narrator — a genuine ambiguity the filmmakers preserve rather than resolve.