Tim Lebbon

One year after Mike Lawford's young son disappeared during a Halloween carnival, he is haunted by eerie images and terrifying messages he can't explain. Together with his estranged wife, he will stop at nothing to unravel the mystery and find their son-and, in doing so, he unearths a legend that refuses to remain buried in the past. (imdb)

The story of a family struggling to survive in a world terrorized by a deadly, primeval species who have bred for decades in the pitch darkness of a vast underground cave system, hunting only with their acute hearing. As the family seeks refuge in a remote haven where they can wait out the invasion, they start to wonder what kind of world will remain when they're ready to emerge.