Kite (2014)

Sawa's a young woman (India Eisley) trying to kill the mysterious "Emir" responsible for the death of her parents. She's getting some help from her late father's old partner (Samuel L. Jackson), but she's taking a pretty haphazard approach to climbing the organizational ladder, as she can't or won't stop trying to kill each person on the ladder as she meets them. Which wouldn't be the worst approach if she didn't keep screwing up and leaving people alive. Which reduces the effectiveness of her appearance as cover, because now people know there's a young woman running around killing people.

The backdrop of the movie is that Sawa's hooked on a drug called amp. I'm unclear on its effects beyond that it obscures or wipes memories. But she struggles to function without it, so Jackson keeps finding some for her, and at the start of the movie, she claims she barely remembers her parents. She has to verbally remind herself who she's after (The Emir) and why (her parents' death.) In the process of one of her attempted kills going sideways, she meets a boy that claims to know her. The longer she's around him, the more she tries to stay off amp, which allows the fog over her memories to clear.

It probably won't surprise you that, as she regains her memories, Sawa finds what she thought was the truth doesn't quite match what she actually remembers.

Eisley plays Sawa as all jagged edges. She snaps and snarls at people who try to help, plays indifferent when they express concern for her. She's vicious in her killing - several guys in a kitchen get kebab skewers jammed places they'd rather not - but it's controlled. It's not a feral anger of someone in grief, just someone determined to kill these people painfully. Probably because the emotional connection was lost with the memories.

Jackson doesn't get a lot to do with his role. He's either giving Sawa grief about getting sloppy, or answering his current partner's questions with evasive comments or mirrored questions. It's more that as the movie progresses, the way you're meant to view those actions changes. He doesn't change, just the audience perspective.