Celebrating five years of marriage, an ordinary woman notices unsettling behavioral shifts in her husband Ethan, who suddenly insists on chauffeuring her from work each evening. Her unease grows when she discovers crimson cosmetics smudged on the leather seats and feminine garments tucked under passenger floor mats in dark underground garages. Even more alarming, muffled knocks and bizarre scratching noises begin vibrating from the vehicle's locked rear cargo space.
Faced with Ethan's increasingly desperate lies and erratic intimidation, she initiates a discreet investigation into his clandestine nighttime activities. She must uncover what horrifying reality he keeps confined inside the chassis before his mounting paranoia turns violently against her.
