It offers little by way of easy answers, and much of the film is up to the interpretation of the individual viewer, for better or worse (probably more better, so long as you know roughly what you're in for).
Scarlett Johansson plays the alien at the center of Under the Skin, and much of the movie is about this life form - after taking on a human appearance - stalking and capturing various men who become prey. It offers little by way of easy answers, and much of the film is up to the interpretation of the individual viewer, for better or worse (probably more better, so long as you know roughly what you're in for).