The balance between the science-fiction horror and more police procedural is a precarious one here, but never tips too much to one side. In fact, by the end, the true fear has less to do with any one foe, whether it’s from land or outer space, but more that we live in a society structured in where your cries for help will land on deaf ears regardless. It’s that sticky sweet kiss of the bleak that raises The Borrower from a fun ride to an essential one.