With his marriage on the rocks, Blake convinces his wife, Charlotte, to escape the city for a quiet retreat at his remote childhood home in rural Oregon. But their getaway takes a terrifying turn when, upon arriving at the farmhouse late at night, they are attacked by an unseen creature lurking in the darkness. Trapped inside as the beast prowls outside, fear and tension mount. But as the night drags on, Charlotte realizes the real danger may not be outside at all—Blake is changing, his behavior growing more erratic, his body shifting into something unnatural. As the truth unravels, Charlotte must face a horrifying realization: she may not be able to escape the monster her husband is becoming.