Henry (Bart Johnson) and Emma Barrett's (Jill Awbrey) marriage is falling apart. Trying to save their relationship, the couple celebrate their nine-year anniversary by renting out a modern vacation home for one weekend, equipped with the top-of-the-line smart home features and security.
However, their weekend getaway takes a turn for the worse when Emma wakes up the next morning in different clothes, and a stranger reveals he's been watching them the whole time, knowing every little secret of their relationship. Henry and Emma attempt to escape, only to be locked in due to the house's automated security system. Held hostage, Henry and Emma must now obey the stranger's every command if they want to live.