I won't summarize the plot too much since you can read from the description.
Children of Men is one of the most realistic sci fi films I've ever seen. This is due mainly to the fact that it's set in the “near-future” where you can spot some technological advancement such as parts of the dashboard integrated into the windshield of the car but overall everything can be recognized as what we have here today.
In this bleak future women have become infertile, and 18 years after this the world has gone to poop. After some unspecificed disasters Britain seems to be the only nation that is still in-tact and the flood of immigrants has become a problem.
I'll just leave the story at that.
First off the cinematography is astounding, the shots are always down low and follows the single main character Theo in a very psuedo-documentary style. The film starts as a slow-burn, the background of the settings are explored, the characters develop well and the relationships between characters are brought out in an effective way when a “truth” is discovered, setting everyone onto the same track.
When there is action it is taken in long-takes, this really kept me engaged as there were no cuts to take me away from this reality despite the visceral action shown on-screen. Wow, am I doing a review or essay I don't even know anymore.
Very highly recommended. My favourite sci-fi movie of all time.