Things can change fast in Texas, especially the weather. Uninvited and unwelcomed, Dan’s estranged mother Margo shows up at his doorstep moments before a freak snowstorm hits their small Texas town. The arctic storm comes fast and hard, trapping Dan and his wife, their teen daughter, and her boyfriend inside with the malicious old woman who seems hell-bent on destroying everything her son and daughter-in-law have built together. Long-buried family secrets are exhumed, causing tensions to flare and tempers to erupt. As things spiral out of control and anger consumes the household, inside is Hell. But outside in the snow there is something far more sinister. Something full of rage. Something violent. And that something has a taste for blood.