A lot of people have recently gone missing in Alexis' hometown of San Antonio, Texas. Alexis is a top reporter for the local news station, and there have been rumors that a serial killer is responsible for those missing.

When a small outpost is ambushed, a US Army squad must take the battle below ground on a high-stakes mission in a new type of warfare the likes of which they have never seen.

They came from a doomed world to save us from the same fate.