If you're not the biggest fan of flies to begin with, this story certainly won't make you like them any more, as the author has turned them into outright bringers of immediate death that leaves few people alive and hiding inside as much as possible. If you like post-apocalyptic novels that aren't too high on the graphic violence scale this could be appealing, but the preview jumps around in point of views too much for me to get a really good feel for the whole story.