Emma and Henry's marriage is losing its spark. In an effort to reconnect on their 9-year anniversary, they vacation to a remote luxury rental, complete with automated smart house features and integrated security. After suspecting a nighttime intruder however, they decide to flee, only to become forcibly trapped inside by the all-encompassing technology. Then a Voice tells them their entire movements are being watched, revealing intimate knowledge about their relationship. As events get more brutal and dehumanizing, Emma and Henry must work together to uncover the truth and find a way out before it's too late.