As I read this book, it began to strike me how Wyndham's world view contrasted with that of Tolkien's. Whereas Tolkien harked back to a pre-industrial time of innocence wishing we might get back closer to nature, Wyndham reminds us that we only invented civilisation as a way of distancing ourselves from the harshness and brutality of nature. There is nothing cosy and secure about mother nature.
Wyndham also tells us that tolerance of difference is a luxury of those who are secure in themselves. We don't feel so inclined to live and let live when we feel threatened.
Gradually the serene and civil veneer of the previously peaceful village of Midwich is peeled back as it becomes apparent to the villagers that they must fight for their survival against a strange invader they do not understand.