Killer Whale review: A micro-thriller that should be better (or worse)

It’s happened just often enough that it might start to look easy: An unambitious B-movie with a story hook that’s simple bordering on ridiculous premieres without much hype, and yields a highly satisfying 90 minutes or so. Movies like Crawl (swimmer fights alligators during a hurricane!), The Shallows (surfer stranded by a shark attack!), Fall (two women stuck very, very high up!), and, just recently, Primate (rabid ape attacks!) exploit their cheap-thrills premises with such gratifying, surprising skill that they can leave viewers feeling reinvigorated: The recipes have remained intact! People still know how to make fun small-scale thrillers!