A powerful post-apocalyptic allegory of persecution and intolerance, the Penguin Modern Classics edition of John Wyndham's science fiction masterpiece The Day of the Triffids contains an introduction by M. John Harrison. Nuclear war has devastated the world, bringing with it a host of genetic mutations. In the bleak, primitive society that has emerged from its ruins, any sign of deviation, no matter how small, is ruthlessly rooted out...