In a small southern community, an old man, Matthew Riley attempts to warn people that "they" are coming. While they ignore his warning words, millions of cicadas emerge from the warm earth singing their eerie song, alerting the populace that they've arrived. Unknown to people in the area, another species is about to appear, and they're much more deadly, aggressive, and horrifying than anyone can imagine.
Can the old man, who appears to be feeble, bewildered, and maybe even mad, prevent the worst disaster to ever befall the human race?