Under the Skin by Michel Faber

This excellent novel was the source for a movie of the same name that starred Scarlett Johansson as an alien who kidnaps hitchhikers who won’t be missed. The movie was artistic but obscure, so it was nice to read the book and finally understand what was going on. 

Both the book and the movie were well-received by the critics, although the book is way, way more disturbing.