When her sister suddenly vanishes, a young girl sets out to find her, desperately searching the internet for clues. Joining her is an ex-CIA agent, who uncovers fragments of online chats the missing girl had with a softcore pornographer.

It is 1879 in the Dakota Territories, a band of men who set out to find and recover a family of settlers that has mysteriously vanished from their home. Expecting the offenders to be a band of fierce natives, but they soon discover that the real enemy stalks them from below.