As the team aboard the Kishorn Bravo oil platform, located near the Scottish shoreline, prepares to head back to land, they are suddenly engulfed by a thick, mysterious fog that severs all their communication with the outside world. When the rig is shaken by powerful tremors, the crew sets out to uncover the source of this enigmatic force. However, a significant mishap compels them to question whom among them they can truly rely on.