After a huge meteor strikes Horsell Common in Surrey, England, the inhabitants of Earth face a vicious attack by an unknown alien race. Amidst the chaos, George leaves his loveless marriage in the hope of starting a new life with Amy, despite the condemnation of the community around them. But George and Amy, alongside every other human on the planet, soon find themselves fighting for their survival against a ruthless enemy beyond their comprehension - an enemy determined to destroy humanity and conquer the planet.