At Standoff, Carter is an army veteran who is not doing too well. Because of everything he saw during his tenure, Carter has not been able to reintegrate into society, so he has done things he is not too proud of.
Now, it seems that life will give her a chance to redeem herself, as she happens to be the only person capable of protecting a twelve-year-old girl, who has witnessed a murder.
The murderers do not want the child to testify, so they look for her to kill her and find her. At that moment, the only protection that has the girl is Carter, who begins a battle more psychological than physical.
Carter is armed, but his shotgun has only one cartridge, so he will have to use the trick of psychology if he wants the girl to come alive, because the truth is that his life matters little to him.