World War Z is a real surprise, writes Kurt Loder. The movie's release was preceded by tales of extensive script-whacking and panicky reshooting. But however desperate these measures may have been, they now seem justified – the picture flows smoothly from one sensational set-piece sequence to the next; it's unremittingly tense and often very scary. It is a full-on zombie movie, Loder reports, but one that relies less on the usual gut-slurping gore and more on the gathering dread of a plausible apocalypse for its horrifying effect. It rises above its genre.