Every parent thinks their kids grow up too quickly-but not like this. In one bewildering, terrifying instant, every child below the age of one disappears-to be replaced by creatures beyond their mothers & fathers' understanding. What happened to the kids? Who are these deranged, hyper-violent adults who've taken their places? One horrified couple do their best to solve the nightmarish puzzle-but before they can find the answers they seek, they must survive the night...