I Am Mother is a post-apocalyptic science fiction movie. In a research facility looking site, Mother (Rose Byrne), is raising one girl, Daughter (Clara Rugaard), born from an embryo. I guess she's supposed to be about 18 when the main plot starts (the caption says 13k days later which is like 30-odd years, oof).

[Edit: I got it, it's 13k days later but this wasn't the first Daughter. Forgot about that part.]

As Daughter prepares for her big test there is a clanging from the airlock. Who could this be? Daughter has been told that all humanity perished due to a plague. When she opens the airlock, it's a Woman (Hilary Swank).

Knowing that Mother would immediately murder the Woman to avoid the plague, Daughter hides Woman. When Mother finds out Daughter convinces Mother to spare Woman, who is taken to the infirmary because she has a gunshot wound.

Now Woman secretly tells Daughter that there was no plague. Robots wiped out humanity, robots just like Mother! Daughter starts to have doubts. Is Mother an evil robot? Or is Woman a deceitful human?...

Turns out to be a pretty good thriller. Fortunately you do get most of the answers by the end of the film.