A young couple, James and Kristen, retreat to a remote vacation home after attending a friend's wedding. The atmosphere between them is tense; the evening earlier had not gone as planned, with James proposing to Kristen only for her to reject him. Their awkward and strained attempt to salvage the night is abruptly interrupted when a mysterious girl appears at the door, asking for someone who doesn't live there. Unsettled but attempting to brush it off, the couple tries to continue their evening until they discover that their cell phone has been stolen and the tires on their car have been punctured. They realize that the earlier visitor may not have been a harmless stranger, and they begin to sense that they're not alone.

Isolation turns into horror as the couple discovers they are being watched and terrorized by three masked strangers. The assailants reveal themselves only through glimpses and unsettling noises, playing a cat-and-mouse game that torments James and Kristen. With their attempts to call for help thwarted and escape routes compromised, they are pushed to their limits trying to survive. The strangers' motives remain unclear, as their actions seem guided by the intent to instill fear rather than any discernible personal vendetta or rational goal. The couple's fight for survival becomes as much a psychological battle as it is a physical one.