The Old Woman with the Knife

This would have made a great movie in the 90ies. A stone hard killer, who's a loner, never deviates from their self-set rules, and is therefore really good at their job. The twist - she's an old woman. And at the end of her life, she gets a little sentimental. Cue - a murderous villain who tests her newfound sentimentality and also unearths a story from her past.

It's plot-driven and quite short and entertaining. All good, yet, I am not so sure this movie would work well these days. Especially since it's lacking depth, and any form of humor.