In a distant future, humanity's relentless expansion into the cosmos leads them to a remote colony on the planet Romulus. The setting is bleak but presents promise with advanced technology supporting the miners and scientists who aim to harvest mineral resources. Among the colonists is Danielle, a young engineer trying to escape her troubled past by starting anew. Her technical knowledge sets her apart, yet she feels a growing unease as unprecedented happenings disrupt the colony. Electrical systems malfunction, and communication with nearby outposts becomes irregular, fostering an air of tension and paranoia among the crew. As Danielle investigates these anomalies, she uncovers evidence suggesting that an uninvited presence has found its way into the colony.

Amidst growing fears and deteriorating conditions, a deadly alien organism begins to hunt the colonists one by one, its presence unraveled through gruesome discoveries. Danielle, along with a small group of survivors including a resourceful scientist named Tom and a pragmatic leader named Jamie, fights for survival. They face a heart-pounding race against time to decipher the alien's behavior and origins while unlocking the mysteries hidden in Romulus's core. Battling against both the alien and their growing mistrust in each other, they must navigate claustrophobic environments, consume fragmentary clues about its weaknesses, and find ways to use the colony's technology to their advantage. The once-promising voyage into the unknown becomes a fight for survival, with survival instincts put to the ultimate test amidst an unforgiving extraterrestrial threat.