"This is one of those films that is so filled with twists, turns and unexpected developments that even the most oblique plot discussion threatens to wander into dreaded spoiler territory. Then again, I admit that I knew pretty much everything that was going to happen going in thanks to my familiarity with the source material, Robert Heinlein's celebrated 1959 short story "—All You Zombies—", and still found myself knocked out by its startlingly effective translation from the page to the screen. I will try to keep the details to a minimum, but, trust me, the less you know going in, the better, especially considering the fact that the story deals in no small part with time travel (and all of the attending paradoxes) and that is not even close to being its most unusual aspect. … Hawke … is an actor who in recent years has more often than not been gravitating towards material that is off-beat and original — at this point, his name on a marquee pretty much guarantees that the film in question will at least be somewhat interesting. … Sarah Snook delivers a knockout performance that calls on her to perform the kind of tricky scenes that could have resulted in bad laughs throughout if handled incorrectly. Not only does she pull off her performance brilliantly throughout — there is not one moment in which she is anything less that utterly convincing and believable — I would go so far as to put her work here up against any of the current front-runners for the Best Actress Oscar."