God, this was good!. At the start it reminded me of Funny Games with the apparently meaningless terrorising of a family with whom we had rapidly got emotionally involved. The setting, in a sunny and apparently idyllic contributed greatly to the success of the film, as did the smartly judicious use of silence on the soundtrack.
Many of the tropes of the bog-standard zombie movie were used -implacable and powerful creatures who seemed to be almost impossible to defeat, but this was very far from being the case.
The ending was superb - the ‘explanation’ suddenly made one change one’s perceptions of the Reds - of humans generally in fact - and the final twist/revelation was stunning. I did NOT see that coming.
A fantastic film; DO see.